Write the major product in each case

Explanation

(b) out of -O- and C=O groups, O is electron-donating and o,p-directing . Therefore , it increases electron density in the benzene ring directly attached to it. As a result, electrophilic substitution occurs in this ring predominantly at the less hindered p-position.

In contrast, the C=O group is electron -withdrawing and m-directing . Since, it decreases and electron density in the ring to which it is attached, therefore, substitution does not occur in this ring.