Which of the following has the minimum heat of dissociation of $N - B$ bond?

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$[{({CH}_{3})}_{3} N \to B {({CH}_{3})}_{2} F]$

$[{({CH}_{3})}_{3} N \to B {({CH}_{3})}_{3}]$

$[{({CH}_{3})}_{3} N \to {BF}_{3}]$

$[{({CH}_{3})}_{3} N \to B ({CH}_{3}) F_{2}]$

answer is D.

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Detailed Solution

$[{({CH}_{3})}_{3} N \to B {({CH}_{3})}_{3}]$ has the minimum heat of dissociation of $N - B$ bond.

Because of the +I action of alkyl groups, trimethyl boron has a decreased propensity to behave as a Lewis acid. As a result, the coordinate bond strength declines, which results in a reduced heat of dissociation.

Hence, option D is correct.

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