Which of the following are benzylic alcohols?
(a) $C_{6} H_{5} - C H_{2} - C H_{2} O H$
(b) $C_{6} H_{5} - C H_{2} O H$
(c) $C_{6} H_{5} - C H | C H_{3} - O H$
(d) $C_{6} H_{5} - C H_{2} - C H | C H_{3} - O H$

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Solution

In benzylic alcohols, the — OH group is attached to a $s p^{3}$ hybridised carbon atom next to an aromatic ring. In compound (a) and (d), the — OH group is attached to a $s p^{3}$ hybridised carbon atom but this carbon is not attached to the benzene ring.
On the other hand, in compound (a) and (c), the - OH group is attached to a $s p^{3}$ hybridised carbon atom next to an aromatic ring.

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