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How many Cl=O (chlorine-oxygen double) bonds are present in one molecule of perchloric acid, HClO4?

1. 1
2. 2
3. 3
4. 4

Correct answer: 3

Solution

In HClO4 the central Cl is bonded to four oxygens: one as Cl-O-H (single bond) and three as Cl=O double bonds, giving 3 Cl=O bonds.

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