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Polarity and Dipole Moments

In which one ...

Question

In which one of the following, the bond angle is the lowest ?

A

H_{3} \oplus O

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B

\oplus N H_{4}

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C

F_{2} O

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D

B C l_{3}

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Solution

The correct option is C $F_{2} O$
The bond angle is the lowest for $F_{2} O$ . The central O atom has 2 lone pairs and 2 bond pairs of electrons. Due to very high repulsion between lone pairs of electrons and high repulsion between lone pair and bond pair of electrons, $F - O - F$ bonds are pushed inwards. This decreases $F - O - F$ bond angle.

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