Question

which homologous series consists of hydrocarbons with double bonds and the general formula $\ce{c_{n}h_{2n}}$? answer options: select one of four olefins (alkenes) paraffins (alkanes) ethers and esters acetylenes (alkynes)

Explanation:

To determine the correct homologous series, we analyze each option:

• Olefins (alkenes): These are hydrocarbons with one carbon - carbon double bond per molecule. Their general formula is \(C_{n}H_{2n}\), which matches the given formula and the description of having double bonds.
• Paraffins (alkanes): Alkanes are saturated hydrocarbons with single bonds only. Their general formula is \(C_{n}H_{2n + 2}\), so this option is incorrect.
• Ethers and esters: These are not hydrocarbons (they contain oxygen atoms), so they do not fit the description of hydrocarbons with double bonds.
• Acetylenes (alkynes): Alkynes have a carbon - carbon triple bond, and their general formula is \(C_{n}H_{2n-2}\), so this option is incorrect.

Answer:

A. Olefins (alkenes)