JEE Main · 2019 · 11 Jan 2019 · Shift 1 · p-Block Elements

The chloride that CANNOT get hydrolysed is

(A) $PbCl_{4}$
(B) $CCl_{4}$ ✓ Correct
(C) $SnCl_{4}$
(D) $SiCl_{4}$

Answer: (B)

Solution

Hydrolysis of a tetrachloride begins with water attacking the central atom, and that needs accessible

d

-orbitals or room to expand the octet so the oxygen lone pair can bond. Silicon, tin and lead all offer such orbitals, so

SiCl X_{4}

SnCl X_{4}

and

PbCl X_{4}

hydrolyse readily. Carbon, confined to its

2 s

and

2 p

orbitals with no

d

-orbitals and a full octet, gives water no site to attack, so

CCl X_{4}

resists hydrolysis.

JEE Main · 2019 · 11 Jan 2019 · Shift 1 · Single correct option

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