Question

The degree of unsaturation of the compound formed by the partial hydrogenation of phenol is:

• A. $3$
• B. $4$
• C. $2$
• D. $1$

Answer 1

Answer: (C)

$2$

The degree of unsaturation of the compound formed by the partial hydrogenation of phenol is 2.
Phenol has 3 $C=C$ double bonds. During the partial hydrogenation of phenol, one
$C=C$ double is hydrogenated and two $C=C$ double bonds remain.