Question

In the given set of compounds, write the decreasing order of % enol content.

• A. $B>A>C>D$
• B. $B>A>D>C$
• C. $A>B>D>C$
• D. $A>D>C>B$

Answer 1

Answer: (B)

$B>A>D>C$

The decreasing order of enol content is $B>A>D>C.$
The enol content of (B) is maximum as there are two possibilities of conjugation of double bond with benzene ring.

In compound (D) 6 $\alpha$-H are present and in compound (C) 4 $\alpha$-H . Hence, more the $\alpha$-H has more the enol content.