Hydrocarbons CBSE Questions & Answers

Hydrocarbons

This is Chemistry Class 11 Hydrocarbons CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

The addition of HBr to 1-butene gives a mixture of products A, B and C. The mixture consists of

A
A and B as minor and C as major products
B
B as major, A and C as minor products
C
B as minor, A and C as major products
D
A and B as major and C as minor products
Correct

Which of the following will not show geometrical isomerism?

A
(iv)
Correct
B
(i)
C
(ii)
D
(iii)

Arrange the following hydrogen halides in order of their decreasing reactivity with propene.

A
HCl > HI > HBr
B
HBr > HI > HCl
C
HCl > HBr > HI
D
HI > HBr > HCl
Correct

Arrange the following carbanions in order of their decreasing stability.(A) H3C – C \( \equiv \)C– (B) H – C ≡ C– (C) \({\text{H3C}} - - - {\text{C}}{{\text{H}}_{\text{2}}}^{ - - }\)

A
C > A > B
B
B > A > C
Correct
C
C > B > A
D
A > B > C

Arrange the following alkyl halides in decreasing order of the rate of \(\beta --\) elimination reaction with alcoholic KOH

A
A > B > C
B
B > C > A
C
C > B > A
D
A > C > B
Correct

Which of the following reactions of methane is incomplete combustion?

A
\({\text{C}}{{\text{H}}_{\text{4}}} + {\text{ 2}}{{\text{O}}_{\text{2}}} - \to {\text{C}}{{\text{O}}_{\text{2}}}\left( {\text{g}} \right){\text{ }} + {\text{ 2}}{{\text{H}}_{\text{2}}}{\text{O }}\left( {\text{l}} \right)\)
B
\({\text{C}}{{\text{H}}_{\text{4}}} + {\text{ }}{{\text{O}}_{\text{2}}} - \to {\text{C}}\left( {\text{s}} \right){\text{ }} + {\text{ 2}}{{\text{H}}_{\text{2}}}{\text{O }}\left( {\text{l}} \right)\)
Correct
C
\({\text{C}}{{\text{H}}_{\text{4}}} + {\text{ }}{{\text{O}}_{\text{2}}}\mathop \to \limits^{M{o_2}{O_3}} {\text{HCHO }} + {\text{ }}{{\text{H}}_{\text{2}}}{\text{O}}\)
D
\({\text{2C}}{{\text{H}}_{\text{4}}} + {\text{ }}{{\text{O}}_{\text{2}}}\mathop \to \limits^{Cu,523K,100atm} {\text{2C}}{{\text{H}}_{\text{3}}}{\text{OH}}\)

Among the following compounds the one that is most reactive towards electrophilic nitration is

A
Nitrobenzene
B
Toluene
Correct
C
Benzoic Acid
D
Benzene

Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?

A
Neohexane
B
Tertiary butyl chloride
C
Neopentane
Correct
D
Isohexane

Ethyl benzene CANNOT be prepared by ______

A
Friedel-Crafts reaction
B
Wurtz-Fittig reaction
C
Clemmensen reduction
D
Wurtz reaction
Correct

Identify B and D in the following sequence of reactions.

A
Ethyl hydrogen sulphate and aqueous KOH
B
Methanol and bromoethane
C
Ethanol and alcoholic KOH
Correct
D
Ethyl hydrogen sulphate and alcoholic KOH

Ozonolysis of an organic compound 'A' produces acetone and propionaldehyde in equimolar mixture. Identify 'A' from the following compounds

A
2 - Methyl - 2 - pentene
Correct
B
2 - Pentene
C
1 - Pentene
D
2 - Methyl - 1 - pentene

Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of

A
An acetylenic triple bond
B
A vinyl group
Correct
C
Two ethylenic double bonds
D
An isopropyl group

The non-aromatic compound among the following is

A
A
B
B
Correct
C
D
D
C

A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is ______.

A
1, 1-dibromopropane
B
1, 2-dibromoethane
C
1, 4-dibromobutane
Correct
D
2, 2-dibromobutane

Which one of these is NOT TRUE for benzene?

A
Heat of hydrogenation of benzene is less than the theoretical value
B
It forms only one type of monosubstituted product
Correct
C
The bond angle between carbon-carbon bonds is \({\text{12}}0^\circ \)
D
There are three carbon-carbon single bonds and three carbon-carbon double bonds