The decreasing values of bond angles from NH_{3} (106°) to SbH_{3} (101°) down group­-15 of the periodic table is due to

  • Option 1)

    increasing bond-­bond pair repulsion

  • Option 2)

    increasing p-orbital character in sp^{3} 

  • Option 3)

    decreasing lone pair­-bond pair repulsion

  • Option 4)

    decreasing electronegativity.

 

Answers (1)
V Vakul

As we learnt in

Electronegativity -

A qualitative measure of the ability of an atom in a chemical compound to attract shared electron is electronegativity.

- wherein

It is not a measurable quantity.

 

 Because of increased bond length of Sb-H bond as compared to N-H bond, the repulsion between lone pair - bond pair electron decreases, resulting in lesser bond angle.


Option 1)

increasing bond-­bond pair repulsion

This option is incorrect.

Option 2)

increasing p-orbital character in sp^{3} 

This option is incorrect.

Option 3)

decreasing lone pair­-bond pair repulsion

This option is correct.

Option 4)

decreasing electronegativity.

This option is incorrect.

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