The decreasing values of bond angles from NH3 (106°) to SbH3 (101°) down group-15 of the periodic table is due to

Question

The decreasing values of bond angles from NH3 (106°) to SbH3 (101°) down group-15 of the periodic table is due to

The decreasing values of bond angles from NH₃ (106°) to SbH₃ (101°) down group-15 of the periodic table is due to
(a) increasing bond-bond pair repulsion
(b) increasing p-orbital character in sp₃
(c) decreasing lone pair-bond pair repulsion
(d) decreasing electronegativity.

Monjur Alahi

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2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

(c) : NH₃PH₃ AsH₃ SbH₃

Bond angle 106.5° 93.5° 91.5° 91.3°

The bond angle in ammonia is less than 109° 28' due to repulsion between lone pairs present on nitrogen atom and bonded pairs of electrons. As we move down the group, the bond angles gradually decrease due to decrease in bond pair lone pair repulsion.