See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

(a) In BCl3. 2P orbital of B will overlap with lone pair of Lewis base while in AlCl3 it is 3 P orbital of Al. (b) back bonding is reason (c) bond strength decreases so reducing power increases (d) bond angle in PH2 : 93.5o Bond angle in NH3 : 107o Bond angle in H2O : 104.5o Bond angle in   2 5 2 C H O is greater than 109o.28