Question

Which of the following are the molecular formula of heptane and heptene respectively?

• A. $C_7{H}_{12}$, $C_7{H}_{14}$
• B. $C_7{H}_{14}$, $C_7{H}_{16}$
• C. $C_7{H}_{14}$, $C_7{H}_{12}$
• D. $C_7{H}_{16}$, $C_7{H}_{14}$

Answer 1

The correct option is D $C_7{H}_{16}$, $C_7{H}_{14}$

$C_7{H}_{16}$, $C_7{H}_{14}$ are the molecular formula of heptane and heptene respectively because they can be represented by the general molecular formula for alkanes as $C_n{H}_{2n+2}$ and alkenes as $C_n{H}_{2n}$ respectively. All you have to do is substitute the value of $n$ with 7 in the given general formula.