The total number of $\sigma$ and $\pi$-bonds in pyrophosphoric acid are respectively

The total number of $\sigma$ and $\pi$-bonds in pyrophosphoric acid are respectively
  1. 8, 2
  2. 10, 2
  3. 12, 2
  4. 8, 4

Solution

The structure of pyrophosphoric acid $\left(\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7\right)$ is as
Hence, it contains $12 \sigma$ and $2 \pi$-bonds.

Asked in: AP EAMCET 2011

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