First slide

Atomic and physical properties

Question

Which of the following has the minimum heat of dissociation ?

Difficult

A

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

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

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

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

Solution

The tendency of trimethyl boron to act as Lewis acid decreases due to +I effect of ${CH}_{3}$ group and thus, coordination becomes weaker.

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