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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: 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 \(C_nH_{2n+2}\)

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.

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