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SSC CPO 2022 PYQ — Question 74

SSC CPO - 9 Nov 2022 - Shift 3 • General Awareness • Q74

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Which of the following pair of compound–general formulas is correct?

I. Alkenes – CnH2n

II. Alkanes – CnH2n−1

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Correct answer: B

Explanation

The correct answer is option 2 i.e. Only I.

The correct pair of compound-general formulas is:

II. Alkanes – CnH2n+2

This formula represents the general formula for alkanes, where "n" represents the number of carbon atoms in the alkane molecule. Each carbon atom forms four single bonds, either with other carbon atoms or with hydrogen atoms. Therefore, the general formula for alkanes is CnH2n+2.

The formula for alkenes is indeed:

I. Alkenes – CnH2n

In alkenes, there is a carbon-carbon double bond, which reduces the number of hydrogen atoms compared to alkanes. Therefore, the general formula for alkenes is CnH2n.