Which of the following adducts has the minimu | vedclass

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(D) The heat of dissociation of an adduct $(CH_3)_3N 	o BX_3$ depends on the strength of the Lewis acid $BX_3$. As the number of electron-donating me

Vedclass · Accepted Answer

$(CH_3)_3N 	o B(CH_3)_3$

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(D) The heat of dissociation of an adduct $(CH_3)_3N 	o BX_3$ depends on the strength of the Lewis acid $BX_3$. As the number of electron-donating methyl groups $(-CH_3)$ on the boron atom increases,the Lewis acidity of the boron compound decreases due to the $+I$ effect. The order of Lewis acidity is $BF_3 > B(CH_3)F_2 > B(CH_3)_2F > B(CH_3)_3$. Since $B(CH_3)_3$ is the weakest Lewis acid among the given options,the adduct $(CH_3)_3N 	o B(CH_3)_3$ has the weakest $N-B$ bond and therefore the minimum heat of dissociation.

Which of the following adducts has the minimum heat of dissociation?

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