Alkanes MCQ

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MCQ on Alkanes for NEET Students

Buta-1,3-diene is a functional isomer of ……….

(A) but-1-yne

(B) propa-1,2-diene

(C) penta-1,2-diene

(D) but-2-ene

Option a – but-1-yne

Which of the following mono-brominated major product is obtained by optically active alkane having the lowest molecular mass?

(A) H3C(CH₂)2CH(CH3)CH₂CH₂Br

(B) H3CCH₂CH(CH3)CH₂CH₂CH₂Br

(C) H3C(CH₂)2C(Br)(CH3)CH₂CH3

(D) H₂C(CH₂)₂2CH(CH3)(Br)CHCH3

Option c – H3C(CH₂)2C(Br)(CH3)CH₂CH3

Ease of formation of alcohol by hydration of alkenes follows the order ……….

(A) 1° alcohol > 2° alcohol > 3° alcohol

(B) 3° alcohol > 2° alcohol > 1° alcohol

(C) 2° alcohol> 3° alcohol> 1° alcohol

(D) 1° alcohol > 3° alcohol > 2° alcohol

Option b – 3° alcohol > 2° alcohol > 1° alcohol

Predict the name of hydrocarbon which gives one mole each of ethanediol and butanediol on ozonolysis.

(A) Cyclohexene

(B) Cyclohexa-1,3-diene

(C) Ethylbenzene

(D) Hexa-1,3-diene

Option b – Cyclohexa-1,3-diene

Terminal alkynes can be converted into nonterminal alkynes by using ………

(A) ammoniacal silver nitrate

(B) ammoniacal cuprous chloride

(C) ethanolic potassium hydroxide

(D) red hot iron tube

Option c – ethanolic potassium hydroxide

Arrange the following in increasing order of acidic strength. Ethene, Ethyne, Ethane, Propyne (i) (ii) (iii) (iv)

(A) iv<ii<i<iii

(B) ii<iv<i<iii

(C) iii<i<iv <ii

(D) i<iv<iii <ii

Option c – iii

The number of 1°, 2°, and 3° C-atoms present in neohexane are ……… respectively.

(A) 3, 2, 1

(B) 2,2, 2

(C) 4, 1,0

(D) 2, 1, 2

Option c – 4, 1,0

The number of carbon and hydrogen atoms in tridecane are ………. respectively.

(A) 23,48

(B) 13,28

(C) 30,62

(D) 20,42

Option b – 13,28

Alkanes C15 to C18 are the constituents of ………

(A) LPG

(B) diesel

(C) CNG

(D) LNG

Option b – diesel

Which of the following is INCORRECT?

(A) Cracking of alkanes: Formation of lower alkanes and alkenes

(B) Wurtz reaction: Formation of higher alkanes from lower alkanes

(C) Decarboxylation of the sodium salt of fatty acids: Formation of alkanes containing one C-atom more than the parent compound

(D) Dehydrogenation of alkanes: Formation of an alkene with the same number of C-atoms

Option c – Decarboxylation of the sodium salt of fatty acids: Formation of alkanes containing one C-atom more than the parent compound

n-Heptane can be converted to toluene by treatment with ……..

(A) alk.KMnO4

(B) alc.KOH

(C) Cr₂O3 at 773K, 10-20 atm

(D) Anhy.AlCl3 at 573 K

Option c – Cr₂O3 at 773K, 10-20 atm

The displacement of H-atoms from hydrocarbon during halogenations follows ………. order

(A) allylic H-atom > 3° H-atom > vinylic H-atom

(B) 3° H-atom > vinylic H-atom allylic H-atom

(C) vinylic H-atom > allylic H-atom > 3° H-atom

(D) allylic H-atom > vinylic H-atom > 3° H-atom

Option a – allylic H-atom > 3° H-atom > vinylic H-atom

Four reactions are given below. Find the reaction in which ethane is NOT produced.

(A) Dry sodium propionate heated with soda lime.

(B) Water is added to aluminum carbide.

(C) Methyl iodide heated with sodium metal in presence of dry ether.

(D) Electrolysis of an aqueous solution of potassium acetate.

Option b – Water is added to aluminum carbide.

Which of the following is CORRECT w.r.t. anti and gauche conformations of ethane?

(A) the anti conformation of ethane is less stable than gauche conformation because anti-conformation has a torsional strain

(B) the gauche conformation of ethane is more stable than anti conformation, because gauche conformation has no torsional strain.

(C) the anti-conformation of ethane is more stable than gauche conformation because anti-conformation has no torsional strain

(D) the gauche conformation of ethane is more stable than anti-conformation even though the gauche conformation has a torsional strain

Option c – the anti-conformation of ethane is more stable than gauche conformation because anti-conformation has no torsional strain

Heptane and octane are major constituents of ……..

(A) CNG

(B) petrol

(C) diesel

(D) LPG

Option b – petrol

The possible number of monocarboxylic acids which on decarboxylation give neopentane is/are ……..

(A) 1

(B) 2

(C) 3

(D) 4

Option a – 1

An alkane with molecular mass 72 forms only one mono-substituted product. Find the alkane.

(A) n-Pentane

(B) 2-Methylbutane

(C) 2,2-Dimethylpropane

(D) 3-Methylpentane

Option c – 2,2-Dimethylpropane

Which of the following haloalkane is the most reactive?

(A) 1-Chlorobutane

(B) 2-Chlorobutane

(C) 1-Iodobutane

(D) 2-lodobutane

Option d – 2-lodobutane

C8H18 has two quaternary carbon atoms. Its structure will have ……….

(A) one – CH₂ and six – CH3 groups

(B) one – CH₂ and five – CH3 groups

(C) two – CH₂ and four – CH3 groups

(D) six – CH3 groups

Option d – six – CH3 groups

Identify the sequence of reagents/conditions required for the conversion of ethane to benzene.

(A) Alc. KOH, Br2, NaNH2, O3/Zn+H2O

(B) Alk.KMnO4, NaOH/CaO, Cl₂/H₂, Na-dry ether

(C) Br₂/CCl4, alc.KOH, NaNH₂, Red hot iron tube/873 K

(D) Hot KMnO4, CH3CH₂Br, Na/dry ether, 873 K

Option c – Br₂/CCl4, alc.KOH, NaNH₂, Red hot iron tube/873 K

Electrolysis of aqueous solution of potassium fumarate gives ……..

(A) ethane

(B) ethyne

(C) propyne

(D) ethane-1,2-diol

Option b – ethyne

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