$B{X_3} + N{H_3}\ \xrightarrow {R.T}\ B{X_3}.N{H_3} +$ 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

    $BI_3$

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