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JEE Main levelSingle correct optionDifficulty 2 of 3pn211

Peroxomonosulphuric acid (Caro's acid), $H X_{2} SO X_{5}$ , contains one peroxo link. The oxidation state of S, the number of S=O bonds and the number of O-O bonds are respectively

A $+ 8$ , 2 and 0
B $+ 6$ , 2 and 0
C $+ 6$ , 1 and 1
D $+ 6$ , 2 and 1

Answer: D

The structure is

HO - O - S (= O) X_{2} - OH

. Oxidation state:

2 (+ 1) + x + 3 (- 2) + 2 (- 1) = 0

gives

x = + 6

. It has two S=O bonds and one O-O link.

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