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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb106

The correct order of H-C-H bond angle in $CH X_{3} X^{+}$ , $CH X_{4}$ and $CH X_{3} X^{-}$ is

A $CH X_{4} > CH X_{3} X^{+} > CH X_{3} X^{-}$
B $CH X_{3} X^{+} > CH X_{4} > CH X_{3} X^{-}$
C $CH X_{3} X^{-} > CH X_{4} > CH X_{3} X^{+}$
D $CH X_{3} X^{+} > CH X_{3} X^{-} > CH X_{4}$

Answer: B

CH X_{3} X^{+}

is trigonal planar (

s p^{2}

,

12 0^{\circ}

).

CH X_{4}

is tetrahedral (

109. 5^{\circ}

).

CH X_{3} X^{-}

is pyramidal with a lone pair (about

10 7^{\circ}

), so the angle shrinks in that order.

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