Q. The decreasing values of bond angles from NH_{3} $(107{^\circ})$to SbH_{3} $(91{^\circ})\$down the group 15 of the periodic table is due to
A) Increasing bp-bp repulsion
B) Increasing p- orbital character in sp^{3}
C) Decreasing lp-bp repulsion
D) Decreasing electronegativity
Explanation
(d)
NH_{3}>PH_{3}>AsH_{3}>SbH_{3}
As the electronegativity of central atom decreases bonded electron polarises towards central atom more, so, repulsion increases and bond angle increases.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.