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Grade: upto college level
The decreasing values of bond angles from NH3 (106°) to SbH3 (101°) down group- 15 of the periodic table is due to
a. decreasing lp-bp repulsion
b. decreasing electronegativity
c. increasing bp-bp repulsion
d. increasing p-orbital character in sp3
5 years ago

Answers : (1)

Deepak Patra
askIITians Faculty
471 Points

b) The bond angle decreases on moving down the group due to decrease in bond pair-bond pair repulsion.

NH3 PH3 ASH3 SbH3 BiH3

107° 94° 92° 91° 90°

NOTE : This can also be explained by the fact that as the size of central atom increases sp3 hybrid orbital becomes more distinct with increasing size of central atom i.e. pure p- orbitals are utilized in M-H bonding

5 years ago
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