Which trihalide is not hydrolysed by water?

N F_{3}

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N C l_{3}

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P C l_{3}

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A s C l_{3}

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Solution

The correct option is A $N F_{3}$
In the first stage of hydrolysis by water, the lone pair on oxygen atom interacts with the compound undergoing hydrolysis. While chlorine and the other group 15 elements (except nitrogen) can expand their octet by using vacant d-orbitals of the valance shell, but both F and N cannot. As a result, $N F_{3}$ is extremely inert towards hydrolysis.
$N F_{3} + H_{2} O (l) ⟶ No hydrolysis$
$N C l_{3} + H_{2} O (l) ⟶ N H_{3} + 3 H O C l$
$P C l_{3} + 3 H_{2} O (l) ⟶ H_{3} P O_{3} + 3 H C l$
$2 A s C l_{3} + 3 H_{2} O (l) ⟶ 6 H C l + A s_{2} O_{3}$

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