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In a molecule of cyclotrimetaphosphoric acid, what is the count of single bonds and double bonds present?

1. 3 double bonds; 9 single bonds
2. 6 double bonds; 6 single bonds
3. 3 double bonds; 12 single bonds
4. Zero double bonds; 12 single bonds

Correct answer: 3 double bonds; 9 single bonds

Solution

Cyclotrimetaphosphoric acid (HPO3)3 is a 6-membered P-O-P ring of 3 P atoms. Each P carries one terminal P=O double bond (3 double bonds total) and the remaining P-O linkages (6 bridging + 3 to OH) give 9 P-O single bonds. So 3 double and 9 single bonds.

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