Question

The group that has $+R$ and $-I$ effects is:

• A. $-CHO$
• B. $-OH$
• C. $C=O$
• D. $CN$

Answer 1

The correct option is B $-OH$

Due to the presence of a lone pair of electron on the oxygen atom which participates in delocalization, $-OH$ group shows $+R$ effect. All among $-CHO,-OH,-C=O$ and $CN$ have $-I$ effect due to the presence of an electronegative atom. Hence $B$ is the correct answer