Question

Consider the following statements about the above reaction:

(I) The major product formed in the above reaction is:

(II) This reaction is an example of Fridel-Crafts alkylation.
(III) The carbocation formed $(C{H}_3{)}_3{C}^{+}$ is less stable than $(C{H}_3{)}_{3}C-\stackrel{+}{C}O$.
(IV) The major product formed in this reaction is:


The correct statement(s) is/are:

• A. (I) only
• B. (I) , (II) and (III)
• C. (II), (III) and (IV)
• D. (II) and (IV)

Answer 1

The correct option is C (II), (III) and (IV)

Compound given in (IV) is formed as the product. The reaction given is Fridel-Crafts alkylation reaction.

The carbocation formed $(C{H}_3{)}_3{C}^{+}$, is less stable than $(C{H}_3{)}_{3}C-\stackrel{+}{C}O$. $(C{H}_3{)}_{3}C-\stackrel{+}{C}O$ is formed first. This reaction is entropy driven as CO expels out and then the stable $(C{H}_3{)}_3{C}^{+}$ is formed.