Question

Calculate the minimum and the maximum number of P-O linkages of identical length in $P_4{O}_{10}$.

(If the answer is 3 and 18, then represent as 318)

Answer 1

It contains 4 double bonds, which are in same size and 12 single bonds of another size. The minimum number is 4 and the maximum number is 12.

Hence, the minimum and maximum number P-O linkages of identical length in $P_4{O}_{10}$ is 412.