B{X₃} + N{H₃}xrightarrow{{R.T}}B{X₃}.N{H₃} + Heat,of,adduct,formation,left( {Delta H} right)

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p-Block Elements - I

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$B{X_3} + N{H_3}\xrightarrow{{R.T}}B{X_3}.N{H_3} + Heat\,of\,adduct\,formation\,\left( {\Delta H} \right)$ The numerical value of $\Delta H$ is found to be maximum for

A

$BF_3$

B

$BCl_3$

C

$BBr_3$

D

$BI_3$

Solution

Lewis acidic strength : $BF_3 < BCl_3 < BBr_3 < BI_3$,

$AsBl_3$ is strongest lewis acid among all boron halides therefore, heat of adduct formation will be maximum numerically, for $BI_3$.

Standard 11

Chemistry

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