The decreasing values of bond angles from NH3 to SbH3 down the group 15 of the periodic table is due to

The decreasing value of bond angles from NH3 (106∘) to SbH3 (91∘) down group-15 of the periodic table is due to decreasing electronegativity. Element N P As Sb Electronegativity 3.0 2.1 2.0 1.9 Bond angle H−M−H 106o45′ 94o 91o30′ 91o As the electronegativity decreases, the bond pair of electrons becomes farther away from the central atom and the repulsion between the bond pair of electrons decreases. Due to this, H−M−H bond angle decreases.

The decreasing values of bond angles from NH3 to SbH3 down the group 15 of the periodic table is due to

The decreasing value of bond angles from NH3 (106∘) to SbH3 (91∘) down group-15 of the periodic table is due to decreasing electronegativity. Element N P As Sb Electronegativity 3.0 2.1 2.0 1.9 Bond angle H−M−H 106o45′ 94o 91o30′ 91o As the electronegativity decreases, the bond pair of electrons becomes farther away from the central atom and the repulsion between the bond pair of electrons decreases. Due to this, H−M−H bond angle decreases.

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The decreasing values of bond angles from NH₃ to SbH₃ down the group 15 of the periodic table is due to

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decreasing lp-bp repulsion

increasing bp–bp repulsion

decreasing electronegativity of central atom

increasing p-orbital character in sp³

answer is D.

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Detailed Solution

The decreasing value of bond angles from NH₃ (106^∘) to SbH₃ (91^∘) down group-15 of the periodic table is due to decreasing electronegativity.

Element	N	P	As	Sb
Electronegativity	3.0	2.1	2.0	1.9
Bond angle H−M−H	106^o45′	94o	91^o30′	91^o

As the electronegativity decreases, the bond pair of electrons becomes farther away from the central atom and the repulsion between the bond pair of electrons decreases.

Due to this, H−M−H bond angle decreases.

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