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

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a
CH33NBF3
b
CH33NBCH3F2
c
CH33NBCH32F
d
CH33NBCH33

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detailed solution

Correct option is D

CH33NBCH33 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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