Q: The correct increasing bond angle order is

(A) BF_{3} < NF_{3} < PF_{3} < ClF_{3}

(B) ClF_{3} < PF_{3} < NH_{3} < BF_{3}

(C) BF_{3} = NF_{3} < PF_{3} < ClF_{3}

(D) BF_{3} < NF_{3} < PF_{3} < ClF_{3}

Solution: Bond angles of ClF_{3}, PF_{3}, NH_{3} & BF_{3} are (180°) (101°), (106°), (120°) respectively

Hence **(B) **is the correct answer.