Question

Which formula represents an unsaturated hydrocarbon?

(1) C2H6 (3) C5H8
(2) C3H8 (4) C6H14

Answer 1

The answer is (3) C5H8. The unsaturated hydrocarbon has double bonds between carbon atoms. And there is a rule of formula that if the carbon number *2 + 2 = hydrogen number, then it is saturated hydrocarbon.

Answer 2

Answer: The correct answer is Option 3.

Step-by-step 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
`C_nH_(2n+2)`

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
`C_nH_(2n)` and
`C_nH_(2n-2)`

For the given options:

Option 1:
`C_2H_6`

This is a saturated hydrocarbon where n = 2.

Option 2:
`C_3H_8`

This is a saturated hydrocarbon where n = 3.

Option 3:
`C_5H_8`

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

Option 4:
`C_6H_(14)`

This is a saturated hydrocarbon where n = 6.

Hence, the correct answer is Option 3.