How many sigma and pi bonds are present in the linear chain compound which has the formula `C_5H_4` and contains both double and triple bonds?

Options

A. 6 sigma and 6 pi
B. 8 sigma and 2 pi
C. 6 sigma and 4 pi
D. 8 sigma and 4 pi

Answer

D

Explanation

According to the formula `C_5H_4`, the Lewis structure for a linear chain compound containing both double and triple bonds will be
`CH-=C-CH=C=CH_2`
or `H-C-=C-overset(H)overset(|)C=C=overset(H)overset(|)C-H`
Every single bond is a sigma bond and every multiple bond contains one sigma bond. Thus, it has 8 sigma bonds and 4 pi bonds.