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Alkanes MCQ. We covered all the Alkanes MCQ in this post for free so that you can practice well for the exam.
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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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