Question

Which of the following pairs does not contain unsaturated hydrocarbons?

• A. $C_4{H}_8,C_3{H}_4$
• B. $C_{10}{H}_{22},C_6{H}_{14}$
• C. $C_2{H}_4,C_6{H}_{12}$
• D. $C_4{H}_6,C_6{H}_{10}$

Answer 1

The correct option is B $C_{10}{H}_{22},C_6{H}_{14}$

Unsaturated hydrocarbons are of two types, alkenes and alkynes. Alkenes have the general formula $C_n{H}_{2n}$, while alkynes have the general formula $C_n{H}_{2n–2}$, where $n=2,3,\dots$
The general formula of saturated hydrocarbons is $C_n{H}_{2n+2}$, where $n=1,2,\dots$
The compounds $C_{10}{H}_{22}$ and $C_6{H}_{14}$ are saturated hydrocarbons because they correspond to the above general formula for values of $n$ as $10$ and $6$ respectively.
Hence, the correct answer is option (b).