STANDARD Chemistry Elimination Reactions MCQ Question
Arrange the following alkyl halides in decreasing order of the rate of β-elimination reaction with alcoholic KOH. (i) CH₃—C—CH₂Br | H (ii) CH₃—CH₂—Br (iii) CH₃—CH₂—CH₂—Br
(i) > (ii) > (iii)
(iii) > (ii) > (i)
(ii) > (iii) > (i)
(i) > (iii) > (ii)
Correct Answer
Detailed Explanation
More the number of β-substituents, more stable alkene it will give on β-elimination. Since (i) has two, (iii) has one β-methyl substituent while (ii) has no β-methyl substituent, therefore, reactivity towards β-elimination decreases in the order: (i) > (iii) > (ii).
Found an issue with this question?
Related Questions
More from
Assertion (A): During the elimination reaction of 2-bromopentane, pent-2-ene is the major product. | Reason (R): The elimination follows Zaitsev's rul...
Which method is used for the preparation of alkyl chlorides from alcohols?
Assertion (A): Aryl halides cannot be prepared by passing dry hydrogen chloride gas through a solution of phenol. | Reason (R): The carbon-oxygen bond...