Question

Which is (are) true regarding the following dehydration reaction?

• A. Reaction involves a carbocation intermediate
• B. Major alkene has $trans$ configuration at double bond
• C. The dehydration involves oxidation-reduction
• D. Either enantiomer of starting alcohol gives the same alkene as major product

Answer 1

Answer: (A), (B), (D)

Reaction involves a carbocation intermediate
Major alkene has $trans$ configuration at double bond
Either enantiomer of starting alcohol gives the same alkene as major product

(c) starting alcohol is enantiomeric but the intermediate carbocation is achiral and the same carbocation would be formed either enantiomer.

Hence options $A,B$ and $D$ are correct.