BITSAT Chemistry Hydrocarbons MCQs

Question: In the following structures, which two forms are staggered conformations of ethane ?

a) 1 and 4

b) 2 and 3

c) 1 and 2

d) 1 and 3

Answer: 1 and 2

Question:

The compounds A and B, respectively are

a) cis-but-2ene and rac-2, 3-dideuterobutane

b) trans-but-2ene and rac-2, 3- dideuterobutane

c) cis-but-2ene and meso-2, 3- dideuterobutane

d) trans-but-2ene and meso-2, 3- dideuterobutane

Answer: cis-but-2ene and meso-2, 3- dideuterobutane

Question: Give the possible structure of X in the following reaction :

a)

b)

c)

d)

Answer:

Question: An organic compound A (C₄H₉Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative, then A is

a) Tert-butyl chloride

b) Sec-butyl chloride

c) Isobutyl chloride

d) N-butyl chloride

Answer: Tert-butyl chloride

Question: Which one of the following reactions is expected to readily give a hydrocarbon product in good yields ?

a)

b)

c)

d)

Answer:

Question: Which of the following chemical system is non aromatic?

a)

b)

c)

d)

Answer:

Question: Which alkene on ozonolysis gives CH₃CH₂CHO and 

a)

b) CH₃CH₂CH = CHCH₂CH₃

c) CH₃ CH₂ CH = CH CH₃

d)

Answer:

Question: What will be the product in the following reaction?

a)

b)

c)

d)

Answer:

Question: Name of following reaction is

a) Claisen Condensation

b) Diel’s Alder reaction

c) Dieckmann cyclisation

d) Michael addition reaction

Answer: Diel’s Alder reaction

Question: The unsaturated hydrocarbon which on ozonolysis gives one mole each of formaldehyde, acetaldehyde and methyl glyoxal (CH₃COCHO) is

a) CH₃ – CH = C( CH₃ ) – CH₃

b) CH₂ = CH – CH₂ – CH = CH₂

c) CH₂ = CH – C( CH₃ ) = CH – CH₃

d) (CH₃ )₂C = CH - CH₃

Answer: CH₂ = CH – C( CH₃ ) = CH – CH₃

Question: Which one of the following contain isopropyl group?

a) 2, 2, 3, 3-tetramethylpentane

b) 2-methylpentane

c) 2, 2, 3-trimethylpentane

d) 3, 3-dimethylpentane

Answer: 2-methylpentane

Question: Compound which has one quaternary carbon atom is :

a) (CH₃)₂ – C – (CH₃)₂

b)

c) (CH₃)₃ CH

d) CH₃ CH₂ – (CH₃)CH – CH₃

Answer: (CH₃)₂ – C – (CH₃)₂

Question: Methane and ethane both can be prepared in one step by which of the following compound?

a) C₂H₄

b) CH₃OH

c) CH₃Br

d) CH₃CH₂OH

Answer: CH₃Br

Question: The most suitable catalyst for the hydrogenation of  is

a) Pd–BaSO₄

b) (Ph₃P)₃RhCl

c) 10% Pd—C

d) Raney Ni

Answer: Pd–BaSO₄

Question: In preparation of alkene from alcohol using Al₂O₃ which is effective factor ?

a) Porosity of Al₂O₃

b) Temperature

c) Concentration

d) Surface area of Al₂O₃

Answer: Surface area of Al₂O₃

Question: Marsh gas contains

a) CO₂

b) CH₄

c) HCl

d) C₂H₂

Answer: CH₄

Question: The reaction  is called

a) Addition reaction

b) Friedel-craft acylation

c) Friedel-craft alkylation

d) Friedel-craft benzoylation

Answer: Friedel-craft alkylation

Question: Which one of the following contain isopropyl group?

a) 2, 2, 3, 3-tetramethylpentane

b) 2-methylpentane

c) 2, 2, 3-trimethylpentane

d) 3, 3-dimethylpentane

Answer: 2-methylpentane

Question: Methane and ethane both can be prepared in one step by which of the following compound?

a) C₂H₄

b) CH₃OH

c) CH₃Br

d) CH₃CH₂OH

Answer: CH₃Br

Question: An organic compound A (C₄H₉Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative, then A is

a) Tert-butyl chloride

b) Sec-butyl chloride

c) Isobutyl chloride

d) N-butyl chloride

Answer: Tert-butyl chloride
 

Question. CH₃CH = CHCHO is oxidized to CH₃CH = CHCOOH using:
a. Alkaline potassium permanganate
b. Acidified potassium permanganate
c. Selenium dioxide
d. Osmium tetroxide
Answer : B

Question. The preparation of ethane by electrolysis of aqueous solution of potassium acetate is called as:
a. Wurtz reaction
b. Sabatier-Senderen's reaction
c. Kolbe's synthesis
d. Grignard reaction
Answer : C

Question. Which of the following represents the most oxidized form of hydrocarbon?
a. CO₂
b. RCHO
c. RCOOH
d. RCOOOH
Answer : A

Question. Which of the following hydrocarbons cannot be obtained by Sabatier and Senderen's reaction?
a. CH₄
b. C₂H₆
c. C₃H₈
d. All
Answer : A

Question. Poisonous gas ‘Lewissite’ is obtained by the reaction of:
a. CH ≡≡ CH and AsCl₃
b. CH₂ == CH₂ and AsCl₃
c. CH ≡≡ CH and S₂Cl₂
d. CH₂ == CH₂ and NOCl
Answer : A

Question.

a. Ethylene bromide
b. Ethanol
c. Ethyl bromide
d. Ethylidene bromide
Answer : C

Question. As the number of carbon atoms in a chain increases the boiling point of alkanes:
a. Increases
b. Decreases
c. Remains same
d. May increase or decrease
Answer : A

Question. The final product of complete oxidation of hydrocarbons is:
a. Acid
b. Aldehyde
c. H₂ O+ CO₂
d. Dihydric alcohol
Answer : C

Question. Markownikoff's rule provides guidance of addition of HBr on:
a. CH₂ == CH₂
b. CH₃ —CH₂ —CH₃
c. CH₃ CH == CHCH₃
d. CH₂ == CHBr
Answer : D

Question. Methane and ethane both can be obtained in single step from:
a. CH₃I
b. C₂H₅I
c. CH₃OH
d. C₂H₅OH
Answer : A

Question. In which of the following, addition of HBr does not take place against Markownikoff's rule or Anti-Markownikoff addition of HBr is not observed for?
a. Propene
b. But-1-ene
c. But-2-ene
d. Pent-2-ene
Answer : C

Question. When alcoholic solution of ethylene dibromide is heated with granulated zinc, the compound formed is?
a. Ethylene
b. Ethyne
c. Cyclobutane
d. Butane
Answer : A

Question. The ratio of σ and π bonds in benzene is
a. 2
b. 4
c. 6
d. 8
Answer : B

Question. Which of the following shows linear structure?
a. Ethane
b. Ethene
c. Acetylene
d. CCl₄
Answer : C

Question. Which of the following used for the conversion of 2- hexyne into trans-2-hexane?
a. H₂ / Pd / BaSO₄
b. H₂ ,PtO₂
c. NaBH₄
d. Li − NH₃ /C₂H₅OH
Answer : D

Question. Which of the following is the most stable alkene?
a. R₂C == CR₂
b. RCH == CHR
c. RCH == CH₂R
d. CH₂ == CH₂
Answer : A

Question. Ethene gives with acidic KMnO₄ solution:
a. Ethylene glycol
b. Ethylene oxide
c. Formaldehyde
d. Acetaldehyde
Answer : C

Question.

a. Benzene
b. Ethane
c. Cycloctatetraene
d. Cyclohexane
Answer : C

Question. Which of the following is a hydrocarbon?
a. Urea
b. Benzene
c. Ammonium cyanate
d. Phenol
Answer : B

Question. In chlorination of benzene, the reactive species is:
a. Cl⁺
b. Cl^–
c. Cl₂
d. Cl₂^–
Answer : A

Question. The reaction of toluene with chlorine in presence of ferric chloride gives predominantly:
a. Benzoyl chloride
b. m-chlorotoluene
c. Benzyl chloride
d. o- and p-chlorotoluenes
Answer : D

Question. Shortest C–C bond length is present in
a. CH₃ −CH₂ −CH₃
b. CH₃CH₂CH₂CH₃
c. CH₂ = CH −CH = CH₂
d. CH ≡ C−C ≡ CH
Answer : D

Question. What happens when a mixture of acetylene an hydrogen is passed over heated Lindlar’s catalyst?
a. Ethane and water are formed
b. Ethylene is formed
c. Acetylene and ethane are formed
d. None of these
Answer : B

Question. What is the product when 2-butyne is treated with liquid NH₃ in presence of lithium?
a. n-butane
b. cis-2-butene
c. trans-2-butene
d. 1-butene
Answer : C

Question. Which of the following compounds exhibit geometrical isomerism?

Answer : A, B, C