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Question

Which of the following has the minimum heat of dissociation?


  1. [(CH3)3 N → B(CH3)3]

  2. [(CH3)3 N → BF3]

  3. [(CH3)3 N → B(CH3)F2]      

  4. [(CH3)3 N → B(CH3)F]


Solution

The correct option is A

[(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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