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Q.

The ease of hydrolysis of trichlorides of group 15 elements decreases in the order

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a

${AsCl}_{3} > {NCl}_{3} > {PCl}_{3} > {SbCl}_{3} > {BiCl}_{3}$

b

${SbCl}_{3} > {BiCl}_{3} > {PCl}_{3} > {NCl}_{3} > {AsCl}_{3}$

c

${NCl}_{3} > {PCl}_{3} > {AsCl}_{3} > {SbCl}_{3} > {BiCl}_{3}$

d

${PCl}_{3} > {NCl}_{3} > {AsCl}_{3} > {SbCl}_{3} > {BiCl}_{3}$

answer is A.

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Detailed Solution

The ease of hydrolysis of trichlorides of group 15 elements decreases in the order NCl₃>PCl₃>AsCl₃>SbCl₃>BiCl₃.
With increase in the metallic character of elements, the halides become more ionic and their tendency towards hydrolysis decreases.

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