Assertion :The $B - F$ bond lengths in $B F_{3}$ and $B F_{4}^{-}$ are different. Reason: In $B F_{3}$ , $B - F$ bond aquires some double bond character.

Read the above assertion and reason and choose the correct option regarding it.

Assertion is true, Reason is true and Reason is correct explanation for Assertion

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Assertion is true, Reason is true and Reason is NOT the correct explanation for Assertion

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Assertion is true, Reason is false

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Assertion is false, Reason is true

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Solution

The correct option is A
Assertion is true, Reason is true and Reason is correct explanation for Assertion

In $B F_{3}$ molecule, the $B - F$ bond has some double bond character whereas in $B F_{4}^{-}$ ion, all the four $B - F$ bonds are single bonds.
Hence, the $B - F$ bond lengths in $B F_{3}$ and $B F_{4}^{-}$ are different.
Thus, Assertion is true, Reason is true and Reason is correct explanation for Assertion.

Suggest Corrections

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Assertion :The $B - F$ bond lengths in $B F_{3}$ and $B F_{4}^{-}$ are different. Reason: In $B F_{3}$ , $B - F$ bond aquires some double bond character.

Read the above assertion and reason and choose the correct option regarding it.