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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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The nucleophillic addition of water to an aldehyde or ketone
The nucleophillic addition of water to an aldehyde or ketone
The nucleophillic addition of water to an aldehyde or ketone
 a. is irreversible.
  b. dependent on the structure of the carbonyl.
  c. favored by neutral conditions.
  d. produces a stable tetrahedral product.
  e. all of t
Ftariq92   39   1 Reply
6 years ago
Which of the following is not a property of a protecting group?
Which of the following is not a property of a protecting group?
Which of the following is not a property of a protecting group?
 a. change the reactivity of a functional group
  b. inert to reaction conditions
  c. becomes a permanent part of the product
  d. alters the mechanism of the desir
hiba4ever   29   1 Reply
6 years ago
Addition of chlorotrimethylsilane to an alcohol
Addition of chlorotrimethylsilane to an alcohol
Addition of chlorotrimethylsilane to an alcohol
 a. results in an SN1 reaction.
  b. requires acidic reaction conditions.
  c. is sterically hindered by the three methyl groups.
  d. results in the formation of an ether.
  e
kdiddy   33   1 Reply
6 years ago
Which of the following is probably the least useful in IR characterization of a compound?
Which of the following is probably the least useful in IR characterization of a compound?
Which of the following is probably the least useful in IR characterization of a compound?
 a. phenol: 3500 cm1
  b. alcohol: 3500 cm1
  c. phenol: 15001600 cm1
  d. ether: 10501150 cm1
  e. all of these are about equally use
azzam_mokhtar@y   33   1 Reply
6 years ago
Which of the following would produce a mixture of products when treated under appropriate conditions ...
Which of the following would produce a mixture of products when treated under appropriate conditions ...
Which of the following would produce a mixture of products when treated under appropriate conditions with N-bromosuccinimide?
 a. oct-4-ene
  b. hept-1-ene
  c. 4,4-dimethylcyclopentene
  d. 4,5-dimethylcyclohexene
  e. all
thereallg   47   1 Reply
6 years ago
The bromination of an alkene using N-bromosuccinimde involves
The bromination of an alkene using N-bromosuccinimde involves
The bromination of an alkene using N-bromosuccinimde involves
 a. the formation of a free radical.
  b. a chain reaction mechanism.
  c. a resonance stabilized intermediate.
  d. maintaining the double bond in the alkene.
 
JaySanz   52   2 Replies
6 years ago
Which of the following statements about an SN2 reaction is true?
Which of the following statements about an SN2 reaction is true?
Which of the following statements about an SN2 reaction is true?
 a. the reaction occurs in two steps
  b. rate = kRX
  c. stabilization of R+ is important
  d. the reaction causes racemization
  e. the reaction is favored b
Alexxxh   61   1 Reply
6 years ago
Which of the following statements about an SN2 reaction is true?
Which of the following statements about an SN2 reaction is true?
Which of the following statements about an SN2 reaction is true?
 a. There are two transition states.
  b. There is one energy maximum.
  c. The transition state can be isolated and studied.
  d. For a carbon electrophile in the
kaaanaaa2   45   1 Reply
6 years ago
Which conditions favor an efficient (fast, high yield) SN2 reaction between an appropriate alkyl ...
Which conditions favor an efficient (fast, high yield) SN2 reaction between an appropriate alkyl ...
Which conditions favor an efficient (fast, high yield) SN2 reaction between an appropriate alkyl halide and a nucleophile with a charge?
 a. high concentration of a strong nucleophile, polar protic solvent
  b. high concentration of a weak
Sheela4875   38   1 Reply
FiercerChin
6 years ago
Which of the following statements about an SN1 reaction is true?
Which of the following statements about an SN1 reaction is true?
Which of the following statements about an SN1 reaction is true?
 a. the reaction occurs in one-step
  b. there is no effect on reaction rate by nucleophile
  c. primary alkyl halides react faster than secondary alkyl halides
  d
tpaige12   48   1 Reply
6 years ago
Nuclear magnetic resonance spectroscopy provides information about a molecule's:
Nuclear magnetic resonance spectroscopy provides information about a molecule's:
Nuclear magnetic resonance spectroscopy provides information about a molecule's:
 a. conjugated pi electron system.
  b. size and formula.
  c. carbon-hydrogen framework.
  d. functional groups.
zojbhiasbdf   42   1 Reply
6 years ago
Which of the following would not produce nuclear magnetic resonance?
Which of the following would not produce nuclear magnetic resonance?
Which of the following would not produce nuclear magnetic resonance?
 a. 2H
  b. 14N
  c. 16O
  d. 19F
zojbhiasbdf   36   1 Reply
6 years ago
Explain why all protons in a molecule do not absorb rf energy at the same frequency.
Explain why all protons in a molecule do not absorb rf energy at the same frequency.
Explain why all protons in a molecule do not absorb rf energy at the same frequency.
Emsga   40   1 Reply
6 years ago
Which feature in the 1H NMR spectrum provides information about the relative numbers of hydrogen ...
Which feature in the 1H NMR spectrum provides information about the relative numbers of hydrogen ...
Which feature in the 1H NMR spectrum provides information about the relative numbers of hydrogen atoms of each type found in a compound?
 a. number of signals
  b. integration of signals
  c. splitting of signals
  d. chemical sh
ziizii   31   1 Reply
6 years ago
Which feature in the 1H NMR spectrum provides information about the electronic environment of the ...
Which feature in the 1H NMR spectrum provides information about the electronic environment of the ...
Which feature in the 1H NMR spectrum provides information about the electronic environment of the protons in a compound?
 a. number of signals
  b. integration of signals
  c. splitting of signals
  d. chemical shift
Sheela4875   37   1 Reply
6 years ago
Which feature in the 1H NMR spectrum provides information about the number of neighboring protons of ...
Which feature in the 1H NMR spectrum provides information about the number of neighboring protons of ...
Which feature in the 1H NMR spectrum provides information about the number of neighboring protons of each proton in the compound?
 a. number of signals
  b. integration of signals
  c. splitting of signals
  d. chemical shift
hiba4ever   46   1 Reply
6 years ago
Which of the following combinations of peaks appears in the 1H NMR spectrum of diethyl ether, ...
Which of the following combinations of peaks appears in the 1H NMR spectrum of diethyl ether, ...
Which of the following combinations of peaks appears in the 1H NMR spectrum of diethyl ether, CH3CH2OCH2CH3?
 a. a triplet and a doublet
  b. a quartet and a sextet
  c. two singlets
  d. a triplet and a quartet
Wafflez4Reason   38   2 Replies
6 years ago
Which of the following combinations of peaks appears in the 1H NMR spectrum of 2-methylpropane?
Which of the following combinations of peaks appears in the 1H NMR spectrum of 2-methylpropane?
Which of the following combinations of peaks appears in the 1H NMR spectrum of 2-methylpropane?
 a. two singlets
  b. a singlet and a nonet
  c. a singlet and a decet
  d. a doublet and a decet
Emsga   59   1 Reply
6 years ago
How many signals appear in the broadband-decoupled 13C NMR spectrum of 1,3-dibromobenzene?
How many signals appear in the broadband-decoupled 13C NMR spectrum of 1,3-dibromobenzene?
How many signals appear in the broadband-decoupled 13C NMR spectrum of 1,3-dibromobenzene?
 a. 1
  b. 2
  c. 3
  d. 4
shabazz627   36   1 Reply
6 years ago
How many signals appear in the broadband-decoupled 13C NMR spectrum of 1,2-dibromobenzene?
How many signals appear in the broadband-decoupled 13C NMR spectrum of 1,2-dibromobenzene?
How many signals appear in the broadband-decoupled 13C NMR spectrum of 1,2-dibromobenzene?
 a. 1
  b. 2
  c. 3
  d. 4
azzam_mokhtar@y   36   1 Reply
6 years ago
Which of the following compounds gives a 1H NMR spectrum consisting of only a singlet and two ...
Which of the following compounds gives a 1H NMR spectrum consisting of only a singlet and two ...
Which of the following compounds gives a 1H NMR spectrum consisting of only a singlet and two signals in the 13C NMR?
 a. 1,1-dibromopropane
  b. 1,2-dibromopropane
  c. 1,3-dibromopropane
  d. 2,2-dibromopropane
ahmedkamal   51   1 Reply
6 years ago
Which of the following compounds gives a 1H NMR spectrum consisting of only two singlets?
Which of the following compounds gives a 1H NMR spectrum consisting of only two singlets?
Which of the following compounds gives a 1H NMR spectrum consisting of only two singlets?
 a. CH3OCH2CH2OCH2CH3
  b. CH3OCH2CH2CH2CH2OH
  c. CH3OC(CH3)2OCH3
  d. CH3OCH2CH(CH3)OCH3
myahwatsonnnnn   57   1 Reply
6 years ago
How many positive and negative peaks appear in the DEPT-135 spectrum of 2,4-dimethylpentane?
How many positive and negative peaks appear in the DEPT-135 spectrum of 2,4-dimethylpentane?
How many positive and negative peaks appear in the DEPT-135 spectrum of 2,4-dimethylpentane?
 a. two positive and one negative
  b. three positive and two negative
  c. four positive and three negative
  d. six positive and one n
daurea829   33   2 Replies
6 years ago
How many positive and negative peaks appear in the DEPT-135 and in the DEPT-90 spectrum of ...
How many positive and negative peaks appear in the DEPT-135 and in the DEPT-90 spectrum of ...
How many positive and negative peaks appear in the DEPT-135 and in the DEPT-90 spectrum of 2-methylpentane?
 a. DEPT-135: two positive and one negative, DEPT-90: one positive
  b. DEPT-135: three positive and two negative, DEPT-90: one pos
kimberlieeike   70   1 Reply
6 years ago
Which of the following statements is true about the structure of benzene?
Which of the following statements is true about the structure of benzene?
Which of the following statements is true about the structure of benzene?
 a. six atomic 2p orbitals interact to form six  molecular orbitals
  b. there are three bonding  molecular orbitals and three  antibonding molecular orbitals
 
Byrondavis   56   1 Reply
6 years ago
Which of the following compounds is aromatic?
Which of the following compounds is aromatic?
Which of the following compounds is aromatic?
 a. ethane
  b. cyclobuta-1,3-diene
  c. benzene
  d. cycloocta-1,3,5,7-tetraene
yelizabeth   45   1 Reply
6 years ago
Which of the following undergoes the most rapid bromination upon treatment with Br2/FeBr3?
Which of the following undergoes the most rapid bromination upon treatment with Br2/FeBr3?
Which of the following undergoes the most rapid bromination upon treatment with Br2/FeBr3?
 a. benzene
  b. nitrobenzene
  c. bromobenzene
  d. benzaldehyde
yelizabeth   52   1 Reply
6 years ago
Which of the following sets of substituents are all o/p-directing in electrophilic aromatic ...
Which of the following sets of substituents are all o/p-directing in electrophilic aromatic ...
Which of the following sets of substituents are all o/p-directing in electrophilic aromatic substitution reactions?
 a. Cl, CH3, CN
  b. Br, OH, COCH3
  c. Cl, OH, CH3
  d. CN, NO2, COCH3
divijnanda   40   2 Replies
6 years ago
Which of the following sets of substituents are all deactivating groups in electrophilic aromatic ...
Which of the following sets of substituents are all deactivating groups in electrophilic aromatic ...
Which of the following sets of substituents are all deactivating groups in electrophilic aromatic substitution reactions?
 a. Cl, CN, NO2
  b. Cl, NH2, CH3
  c. CH3, OCH3, COCH3
  d. CH3, NH2, OCH3
kjustice4   43   1 Reply
6 years ago
Which of the following does not correctly characterize a nucleophilic aromatic substitution ...
Which of the following does not correctly characterize a nucleophilic aromatic substitution ...
Which of the following does not correctly characterize a nucleophilic aromatic substitution reaction?
 a. favored by electron-withdrawing groups
  b. carbanion intermediates
  c. NO2 and CHO activate the ring
  d. NO2 and CHO are
Stringfield73   88   1 Reply
6 years ago
Which of the following would be an o/p-director in a nucleophilic aromatic substitution reaction? ...
Which of the following would be an o/p-director in a nucleophilic aromatic substitution reaction? ...
Which of the following would be an o/p-director in a nucleophilic aromatic substitution reaction?
 a. CH3
  b. OH
  c. F
  d. CN
  e. all of these
captain lala   105   1 Reply
16brehan
6 years ago
An accurate description of the structure of benzene is:
An accurate description of the structure of benzene is:
An accurate description of the structure of benzene is:
 a. The  bonds are quickly moving around the ring.
  b. There are two distinct structures that are in equilibrium.
  c. All the carboncarbon bonds are equal in length.
  d.
divijnanda   47   1 Reply
6 years ago
Which of the following is a correct statement regarding electrophilic aromatic substitution?
Which of the following is a correct statement regarding electrophilic aromatic substitution?
Which of the following is a correct statement regarding electrophilic aromatic substitution?
 a. The carbocation intermediate will lose a proton to regain aromaticity, usually from a position other than the site of electrophilic attack.
 
kesgirl   42   1 Reply
6 years ago
The reaction conditions to carry out the production of cyclopentene using bromocyclopentane as the ...
The reaction conditions to carry out the production of cyclopentene using bromocyclopentane as the ...
The reaction conditions to carry out the production of cyclopentene using bromocyclopentane as the starting material would be:
 a. KOH, CH3CH2OH
  b. H2SO4, THF
  c. H2O2, OH
  d. Hg(OAc)2,H2O
cbdancer032895   37   2 Replies
6 years ago
Which set of reagents is used for the Markovnikov addition of water to an alkene without ...
Which set of reagents is used for the Markovnikov addition of water to an alkene without ...
Which set of reagents is used for the Markovnikov addition of water to an alkene without rearrangement?
 a. BH3, THF followed by H2O2, NaOH
  b. H2O, H2SO4
  c. Hg(O2CCH3)2, H2O followed by NaBH4, NaOH
  d. none of these
Porkles   72   1 Reply
6 years ago
What type of reactive intermediate is formed in the reaction of an alkene with HBr to give a ...
What type of reactive intermediate is formed in the reaction of an alkene with HBr to give a ...
What type of reactive intermediate is formed in the reaction of an alkene with HBr to give a bromoalkane?
 a. carbocation
  b. carbanion
  c. radical
  d. cyclic bromonium ion
divijnanda   56   1 Reply
6 years ago
What type of reactive intermediate is involved in both of the following general reaction types? 1) ...
What type of reactive intermediate is involved in both of the following general reaction types? 1) ...
What type of reactive intermediate is involved in both of the following general reaction types? 1) reaction of an alkene with Br2 in the presence of water to give a bromohydrin 2) two-step hydroxylation of an alkene
 a. carbocation
  b. ca
Nightmare7171   33   1 Reply
6 years ago
What type of reactive intermediate is formed in the reaction of an alkene with aqueous acid to give ...
What type of reactive intermediate is formed in the reaction of an alkene with aqueous acid to give ...
What type of reactive intermediate is formed in the reaction of an alkene with aqueous acid to give an alcohol?
 a. carbocation
  b. carbanion
  c. radical
  d. carbene
captain lala   73   1 Reply
6 years ago
What type of reaction mechanism is involved in the reaction of an alcohol with aqueous acid to give ...
What type of reaction mechanism is involved in the reaction of an alcohol with aqueous acid to give ...
What type of reaction mechanism is involved in the reaction of an alcohol with aqueous acid to give an alkene?
 a. nucleophilic addition
  b. electrophilic addition
  c. radical addition
  d. elimination
Nightmare7171   67   1 Reply
6 years ago
A molecule has three degrees of unsaturation. In this molecule there would be
A molecule has three degrees of unsaturation. In this molecule there would be
A molecule has three degrees of unsaturation. In this molecule there would be
 a. three rings
  b. three double bonds
  c. two rings and one double bond
  d. one ring and two double bonds
  e. any of these
Ftariq92   48   1 Reply
6 years ago
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