JEE Main · 2021 · 31 Aug 2021 · Shift 2 · p-Block Elements

The number of

S = O

bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are :

(A)2, 3 and 4
(B)1, 4 and 3
(C)1, 4 and 4✓ Correct
(D)2, 4 and 3

Answer: (C)

Solution

In sulphurous acid,

H_{2} S O_{3}

, the pyramidal sulphur carries two

- OH

groups, one lone pair and one

S = O

bond, giving one

S = O

. Peroxodisulphuric acid,

H_{2} S_{2} O_{8}

, has two tetrahedral sulphurs joined by a peroxide

- O - O -

bridge, each sulphur holding two

S = O

bonds, giving four. Pyrosulphuric acid,

H_{2} S_{2} O_{7}

, has the two sulphurs joined by a single oxygen bridge, each again with two

S = O

bonds, giving four. The numbers of

S = O

bonds are

1

4

and

4

respectively.

JEE Main · 2021 · 31 Aug 2021 · Shift 2 · Single correct option

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