Q3 / 170 · Manipal (MET) 2021 · Chemistry

Successive alkanes differ by :

  • Correct answer
    A
    $\mathrm{CH}_2$
  • B
    $CH$
  • C
    $\mathrm{CH}_3$
  • D
    $\mathrm{C}_2 \mathrm{H}_4$

Solution

Alkanes have a general formula $\mathrm{C}_n \mathrm{H}_{2 n+2}$ So, when $\begin{aligned} & n=1, \mathrm{C}_1 \mathrm{H}_{2 \times 1+2}=\mathrm{CH}_4 \\ & n=2, \mathrm{C}_2 \mathrm{H}_{2 \times 2}+2=\mathrm{C}_2 \mathrm{H}_6 \\ & n=3, \mathrm{C}_3 \mathrm{H}_{2 \times 3+2}=\mathrm{C}_3 \mathrm{H}_8\end{aligned}$
So, the all have a difference of $\mathrm{CH}_2$.

Hence, the correct answer is option: 'A'.

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