Which of the following halides cannot be hydrolysed at room temperature?
(I) TeF₆ (II) SF₆(III) NCI₃ (IV) NF₃
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III and IV

I, II and III

I, II and IV

II and IV

answer is D.

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Detailed Solution

In SF₆, S sterically hindered by six fluorine atoms hence, attack of H₂O molecule will not occur. NF₃ is not hydrolysed due to absence of vacant orbital either on N of F atom.
TeF₆ is hydrolysed due to large size of Te.

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