Which of the following has the minimum heat of dissociation?

[(CH₃)₃ N → BF₃]

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[(CH₃)₃ N → B(CH₃)F₂]

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[(CH₃)₃ N → B(CH₃)₂F]

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[(CH₃)₃ N → B(CH₃)₃]

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Solution

The correct option is D
[(CH₃)₃ N → B(CH₃)₃]

Solution: The tendency of trimethyl boron to act as Lewis acid decreases due to +I effect of alkyl groups and therefore the coordinate bond strength decreases which is responsible for the lower heat of dissociation in option (d).

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