The correct order of bond angle for NH3, PH3, and AsH3 is: — Solution | JEE Chemistry

MCQEasyJEE 2024VSEPR Theory & Shapes of Molecules

The correct order of bond angle for $NH_3$ , $PH_3$ , and $AsH_3$ is:

Answer

Correct answer:A

Standard Method

Given: The hydrides are $NH_3$ , $PH_3$ , and $AsH_3$ .

Find: The correct decreasing order of their bond angles.

Using VSEPR theory and electronegativity differences, the bond angle decreases down the group.

Therefore, the correct order is $NH_3 > PH_3 > AsH_3$ .

The correct option is A.

Assuming all group $15$ hydrides have the same bond angle is incorrect because the central atom changes down the group, which affects hybridization tendency and bond pair arrangement. Compare the trend rather than treating them as identical.
Reversing the order by thinking heavier central atoms always give larger bond angles is incorrect here. Down the group, bond angle decreases for $NH_3$ , $PH_3$ , and $AsH_3$ .

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