Which of the following alkenes exhibit E - Z isomerism? I. CM_3 CH_2 CH = CH CH_

Question

Which of the following alkenes exhibit E - Z isomerism? I. CM_3 CH_2 CH = CH CH_2 CH_3 II. (CH_2)_2 C = CH CH_3 III. CH_3 CH_2 CH = CHBr IV. H_2 C = CH CH_2 CH (CH_3)_2 A) I and II B) I and III C) II and IV D) I, II, and III The acid-catalyzed dehydration of the alcohol shown below gives a major product which results from a carbocation rearrangement. Identify this major product. Rank the following three compounds in order of increasing boiling point. I. CH_3 CH_2 CH_3 II. CH_3 CH_2 OH III. CH_3 OCH_3 A) I

Explanation / Answer

23) option B is correct

Explanation: E-Z isomerism is exhibited by compounds having different atoms at terminal carbon atoms.

24) option A is correct

Explanation: dehydration of alcohol invovles a carbocation as an intermediate. Now, 1,2-methyl shift produces a more stable carbocation. This on further deprotonation produces more substituted alkene as product.

25) option B is correct

Explanation: Alcohols have highest boiling point due to the formation of hydrogen bonding. Then ethers have highest boiling point than alkanes.

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