In which of the following cases, the increase in bond angle is not due to back bonding?

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$SiNSi angle in N {({SiH}_{3})}_{3}$

$\hat{FBF} angle in {BF}_{3}$

$F - \hat{P} - F angle in {PF}_{3}$

$COC$ angle in ${CH}_{3} {OCH}_{3}$

answer is A.

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Detailed Solution

Back bonding has an impact on the bond angle. The bond angle is unaffected because the $COC$ angle in ${CH}_{3} {OCH}_{3}$ does not require a lone pair for back bonding on the central atom.

Repulsions due to large methyl groups.

A form of resonance known as back bonding is present in many chemical compounds. Back bonding is supposed to increase the stability of chemical compounds. Therefore, choice A is the right one.

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