The angle between two covalent bonds is minimum in

The angle between two covalent bonds is minimum in H₂O.

(A) In H₂O, there are two O-H bonds and two lone pairs on central oxygen. So there exist lone pair - lone pair repulsions, which causes decrease in bond angle from 109^o28' to 104^o.

(B) CO₂ has linear shape and bond angle is 180^o

(C) In NH₃(one l.p+3b.p), there exists bond pair - lone pair repulsions. so the bond angle decreases to 107^o.

(D) CH₄ has four bond pairs, so the bond angle is 109^o28' .