Which formula represents an unsaturated hydrocarbon?
(1) c2h6 (3) c5h8
(2) c3h8 (4) c6h14

The correct answer is Option 3.

Explanation:

Saturated hydrocarbons are defined as the hydrocarbons which have single covalent C-C bonds. They are known as alkanes. The general formula for these hydrocarbons is

Unsaturated hydrocarbons are defined as the hydrocarbons which have double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is and

For the given options:

Option 1:

This is a saturated hydrocarbon where n = 2.

Option 2:

This is a saturated hydrocarbon where n = 3.

Option 3:

This is an unsaturated hydrocarbon where n = 5. It is an alkyne.

Option 4:

This is a saturated hydrocarbon where n = 6.

Hence, the correct answer is Option 3.

you need to have a picture of the atom that way we can answer it