Which of the following orders regarding the bond enthalpy of $M - H$ bond in the hydrides of Group 15 elements is correct?

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$N - H < P - H < As - H$

$N - H > P - H < As - H$

$N - H > P - H > As - H$

$N - H < P - H > As - H$

answer is A.

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Detailed Solution

$N - H$ bond is more stronger than $P - H$ which, in turn, is stronger than As $- H$ . Order regarding the bond enthalpy of $M - H$ bond in the hydrides of Group 15 elements is,

$N - H > P - H > As - H$

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