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Question

Which of the following cannot be hydrolysed?

A
SiCl4
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B
OF2
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C
NCl3
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D
SF4
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Solution

The correct option is B OF2
(a) SiCl4+4H2OSi(OH)4+4HCl (by SN2 mechanism)
Si has vacant d-orbitals which can accept lone pair from O atom in H2O to form bonds.

(b) OF2 hydrolyses in water but the reaction is very slow.
OF2+H2OO2+2HF

(c) NCl3+3H2ONH3+3HOCl
H2O attacks Cl which has vacant d-orbitals and not N

(d) SF4+2H2OSO2+4HF
S has vacant d-orbitals which can accept lone pair from O atom in H2O to form bonds.

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