Alkane MCQs

Alkanes are saturated hydrocarbons characterized by their open-chain structure with carbon-carbon single bonds. They are also called paraffins because of their inert properties. The general formula for alkanes is CₙH₂ₙ₊₂. These compounds are commonly obtained from natural gas and petroleum.

Find the correct order for relative energies of the ethane conformations

(a) staggered < skewed < eclipsed
(b) skewed < staggered < eclipsed
(c) skewed < eclipsed < staggered
(d) staggered < eclipsed < skewed

Alkanes undergo halogenation. It is an example of

(a) nucleophilic substitution
(b) elimination
(c) free-radical substitution
(d) electrophilic substitution

Which of the following conformation of n-butane is the most stable?

(a) eclipsed
(b) gauche
(c) staggered
(d) skew boat

Find the correct order for the ease of formation of free radicals

(a) 1° > 2° > 3°
(b) 3° > 2° > 1°
(c) 2° > 1° > 3°
(d) 2° > 3° > 1°

Paraffin wax is

(a) Saturated hydrocarbons
(b) Unsaturated hydrocarbons
(c) Alcohol
(d) Ester

Find the compound with the highest boiling point among the following

(a) n-Butane
(b) n-Octane
(c) Iso-octane
(d) 2,2,3,3-Tetramethylbutane

The bond angle between H-C-C bonds in ethane is

(a) 120°
(b) 180°
(c) 109°
(d) 109.5°

Formation of an alkane from the reduction of an alkyl halide with Zn is known as

(a) Cannizzaro reaction
(b) Frankland reaction
(c) Kolbe reaction
(d) Wurtz reaction

Which of the following is the most volatile compound?

(a) n-pentane
(b) Isobutane
(c) 2-methyl butane
(d) 2, 2-dimethyl propane

Find the alkane (C5H12), which will give only one type of monohalogenated compound

(a) 2,2-dimethylpropane
(b) 2-methylbutane
(c) cyclopentane
(d) n-pentane