Question

A hydrocarbon of general formula

${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}}$

• A. ${\mathrm{C}}_{15}{\mathrm{H}}_{30}$
• B. ${\mathrm{C}}_{12}{\mathrm{H}}_{26}$
• C. ${\mathrm{C}}_8{\mathrm{H}}_{20}$
• D. ${\mathrm{C}}_6{\mathrm{H}}_{14}$

Answer 1

The correct option is A

${\mathrm{C}}_{15}{\mathrm{H}}_{30}$

Explanation for the correct option

(A) ${\mathrm{C}}_{15}{\mathrm{H}}_{30}$

Definition of IUPAC names

IUPAC nomenclature of organic chemistry is a method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry

Alkene

• an alkene is a hydrocarbon containing a carbon-carbon double bond.
• branched or unbranched hydrocarbons that have a general formula of ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}}$
• The formula ${\mathrm{C}}_{15}{\mathrm{H}}_{2\mathrm{x}15}$ satisfies the formula ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}}$

Explanation for the incorrect option

(B) ${\mathrm{C}}_{12}{\mathrm{H}}_{26}$

Alkane

• Compounds having carbon and hydrogen atoms with single covalent bonds
• The general formula for alkanes are ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}$
• This means if 12 carbon is there, according to the formula there should be 26 hydrogens : ${\mathrm{C}}_{12}{\mathrm{H}}_{2\mathrm{x}12+2}$

(C) & (D)

${\mathrm{C}}_8{\mathrm{H}}_{20}$& ${\mathrm{C}}_6{\mathrm{H}}_{14}$ doesn't fulfill the formula ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}}$

Therefore, ${\mathrm{C}}_{15}{\mathrm{H}}_{30}$is the formula for an alkene and satisfies the formula ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}}$