(i) 3 double bonds; 9 single bonds
(ii) 6 double bonds; 6 single bonds
(iii) 3 double bonds; 12 single bonds
(iv) Zero double bonds; 12 single bonds
Correct Answer: (ii) 6 double bonds; 6 single bonds
Explanation: In a cyclotrimetaphosphoric acid molecule, 6 double bonds and 6 single bonds are present.