79.
(A)
(B)
(C)
(D)

答案：登入後查看
統計： A(2), B(1), C(0), D(0), E(0) #3829698

相關試題

80.(A) (B) (C) (D)

1. Chain-growth polymerization proceeds by which of the following mechanisms?(A) radical polymerization (B) cationic polymerization (C) anionic polymerization(D) A and В (E) A, B, and C

2. Identify the following compounds as R or S.(A) S, S, R (B) S, R, S (C) R, S, S (D) S, S, S (E) R, R, R

3.What is the carbon nucleophile which attacks molecular bromine in the acid-catalyzed a-bromination of a ketone?(A) an enolate(D) a carbocation(B) a Grignard reagent (C) an acetylide(E) an enol

4. In nucleophilic acyl substitution(A) protonation of the carbonyl is followed immediately by loss of the leaving group.(B) loss of the leaving group is followed by rearrangement of the carbocation.(C) addition to the carbonyl by a nucleophile is followed by loss ofthe leaving group.(D) ester hydrolysis is followed by deprotonation.(E) an SN2 reaction occurs.

5. Dicyclohexylcarbodiimide (DCC) is used(A) to determine the N-terminal amino acid of a peptide.(B) to sequence amino acids in a peptide.(C) to detect amino acids derived from hydrolysis of a peptide.(D) to couple amino acids during solid-phase peptide synthesis.(E) to hydrolyze peptides on the carboxyl side of aromatic amino acid residues.

6. What type of intermediate is present in the SN2 reaction of cyanide with bromoethane?(A) carbocation(D) carbanion(B) free radical (C) carbene(E) This reaction has no intermediate.

7. Predict the specific rotation of the compound shown.(A) It is impossible to predict; it must be determined experimentally.(B) Because both asymmetric centers are R, the compound is dextrorotatory.(C) Because both asymmetric centers are S, the compound is dextrorotatory.(D) Zero; the compound is achiral.(E) Because this compound represents a racemic mixture, the compound is dextrorotatory.

8. Which molecule below has a significant band in the 1720-1780 cm-1 range of its IR spectrum? (A) CH3CH2CH₂OH (B) CH3C=CCH2CH3 (C) CH3CH2CH(NH2)CH3 (D) (CH3)3N(E) CH3CO₂CH2CH3

9. Which of the compounds below undergoes solvolysis in aqueous ethanol most rapidly?(A) 3-iodo-3-methylpentane (B) methyl iodide (C) isopropyl chloride(D) 3-chloropentane(E) cyclohexyl bromide

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