with cyanide ion in Which compound reacts most rapidly ion polar, aprotic solven
ID: 698948 • Letter: W
Question
with cyanide ion in Which compound reacts most rapidly ion polar, aprotic solvenr? (A) 2-chlorn-2-methylbutane (B) 2 bromo- 2-methylbutane C) 1-chloro-2-methylbutane (D) I-chloro-3-methylbutane Which reaction conditions could be used to affect this 34. Which undergoes ionization in aqueous acetone mo rapidly? CH-Br 31. Br (B) Br,/ FeBr, 35. What is the product of this cross coupling reaction? heat A) HBr. ROOR, (C) NBS, ROOR, heat (D) PBr, 32. Which compound is most readily deprotonated by strong base? (A) H (B) H 33. Which compound has a mass spectrum that contains M and IM+21 peaks with almost equal intensity? Ci Which is the major product of this reaction? 36. CH2CH3 (C) OExplanation / Answer
30) option D is correct
Explanation: In polar aprotic solvent, SN2 reaction occurs. SN2 reaction is favourable with sterically less hindered alkyl halides. 1-chloro-3-methylbutane is sterically less hindered alkyl halide so it is most reactive in polar aprotic solvent.
31) option C is correct
Explanation: NBS is a brominating agent which gives bromination at benzylic position.
32) option A is correct
Explanation: The negative charge produced by the lost of proton in compound A is more stable as it attains aromaticity.
33) optoin A is correct
34) option D is correct
Explanation: -OCH3 group is an electron donating group which stabilizes carbocation produced by the lost of halide ion.
35) option A is correct
Explanation: The reaction of organoborane reagent with alkyl halide produces alkylated product.
36) option C is correct
Explanation: Reaction of alpha, beta-unsaturated carbonyl compound with organo copper reagent produces 1,4-addition product which on further reaction with alkyl halide produces alpha alkylation.
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