BX_3 + NH_3 xrightarrow{R.T} BX_3 cdot NH_3 + | vedclass

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Question

(D) The heat of adduct formation $(\Delta H)$ is directly proportional to the Lewis acidic strength of the boron trihalide $(BX_3)$.Lewis acidic stren

Vedclass · Accepted Answer

$BI_3$

Vedclass · Answer

(D) The heat of adduct formation $(\Delta H)$ is directly proportional to the Lewis acidic strength of the boron trihalide $(BX_3)$.Lewis acidic strength order for boron trihalides is: $BF_3 This trend is explained by the extent of back-bonding ($p\pi-p\pi$ overlap) between the halogen and boron atoms,which is maximum in $BF_3$ and minimum in $BI_3$.Since $BI_3$ is the strongest Lewis acid,it releases the maximum amount of energy upon forming an adduct with the Lewis base $NH_3$.

$BX_3 + NH_3 \xrightarrow{R.T} BX_3 \cdot NH_3 + \text{Heat of adduct formation } (\Delta H)$. The numerical value of $\Delta H$ is found to be maximum for

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