CBSE Class 10 Science 2024: question 6

Hints

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Step-by-step solution

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1. ${\mathrm{C}}_4{\mathrm{H}}_{10}$, ${\mathrm{C}}_5{\mathrm{H}}_{12}$ and ${\mathrm{C}}_2{\mathrm{H}}_6$ all fit ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2n+2}$, so they are alkanes (saturated).

2. ${\mathrm{C}}_7{\mathrm{H}}_{14}$ fits ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2n}$, so it is an alkene (or a cycloalkane). It is the odd one out, option (B).

   1 mark

Answer: ${\mathrm{C}}_7{\mathrm{H}}_{14}$, option (B)

Revise the chapter

• Chapter: Carbon and its Compounds (notes, formulas, where marks are lost and every past question)
• Topic: Homologous Series and Nomenclature