Question

Find the number of hydrogen atom(s) required to complete the covalency of all the atoms in given skeleton.

$\begin{array}{c} \text{O} \\ \text{||} \\ \text{C-C=C-C} \\ \text{||} \\ \text{O} \end{array}$

Answer 1

4

Answer 2

The skeleton O=C-C=C-C=O requires 1 H on each carbon to complete valency. Total 4 H.