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Question

The hexahalide that is most readily hydrolysed is:

A
SF6
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B
SeF6
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C
TeF6
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D
TeCl6
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Solution

The correct option is D TeF6
TeF6 is most readily hydrolysed.
Te has large size and F has small size. Also there is large electronegativity difference between Te and F.
Hence, TeF bond is weaker and the bond pair of electrons are more towards F. Thus, Te has more tendency for nucleophilic attack.

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