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

1
Which of these fuels not a Hydrocarbon?
  • A
    LNG
  • B
    CNG
  • C
    Hydrogen
    Correct
  • D
    LPG
2
Saturated Hydrocarbons contain
  • A
    double bonds
  • B
    triple bonds
  • C
    ionic bonds
  • D
    single bonds
    Correct
3
in cycloalkanes carbon atoms form
  • A
    a zigzag chain
  • B
    a open coiled chain
  • C
    a closed chain or a ring
    Correct
  • D
    a an open chain
4
Which of these is not a characteristic of aromatic Hydrocarbons?
  • A
    carbon atoms form a closed chain or ring
  • B
    they are special type of cyclic compounds
  • C
    carbon atoms form a an open chain
    Correct
  • D
    they may contain double bonds
5
The number of chain isomers of \({{\text{C}}_{\text{5}}}{{\text{H}}_{{\text{12}}}}\) is
  • A
    4
  • B
    3
    Correct
  • C
    5
  • D
    2
6
in the Wurtz reaction method of preparation of alkanes, the stoichiometric coefficient of Sodium is
  • A
    2.0
    Correct
  • B
    3
  • C
    5
  • D
    1
7
The number of possible conformational isomers of ethane is
  • A
    one
  • B
    zero
  • C
    two
  • D
    infinite
    Correct
8
boiling point of alkanes
  • A
    increases with increase in molecular mass
    Correct
  • B
    is independent of branching
  • C
    decreases with increase in molecular mass
  • D
    is independent of molecular mass
9
Halogenation of alkanes is a
  • A
    Addition reaction
  • B
    Rearrangement reaction
  • C
    Elimination reaction
  • D
    Substitution reaction
    Correct
10
General formula for alkenes is
  • A
    \({{\text{C}}_{\text{n}}}{{\text{H}}_{{\text{2n}} + {\text{3}}}}\)
  • B
    \({{\text{C}}_{\text{n}}}{{\text{H}}_{{\text{2n}} + {\text{1}}}}\)
  • C
    \({{\text{C}}_{\text{n}}}{{\text{H}}_{{\text{2n}} + {\text{2}}}}\)
  • D
    \({{\text{C}}_{\text{n}}}{{\text{H}}_{{\text{2n}}}}\)
    Correct
11
Carbon-carbon double bond in alkenes consists of
  • A
    one weak sigma \(\left( \sigma \right)\) bond due to head-on overlapping of \({\text{s}}{{\text{p}}^{\text{2}}}\) hybridised orbitals one weak pi \(\left( \pi \right)\) bond
  • B
    one strong sigma \(\left( \sigma \right)\)bond due to head-on overlapping of \({\text{s}}{{\text{p}}^{\text{3}}}\) hybridised orbitals one weak pi \(\left( \pi \right)\)bond
  • C
    one weak sigma \(\left( \sigma \right)\) bond due to head-on overlapping of \({\text{s}}{{\text{p}}^{\text{3}}}\) hybridised orbitals one weak pi \(\left( \pi \right)\)bond
  • D
    one strong sigma \(\left( \sigma \right)\) bond due to head-on overlapping of \({\text{s}}{{\text{p}}^{\text{2}}}\) hybridised orbitals one weak pi \(\left( \pi \right)\) bond
    Correct
12
In the alkene having IUPAC name 3-Methyl-1-butene the double bond lies on carbon atom numbered
  • A
    4
  • B
    2
  • C
    1
    Correct
  • D
    3
13
Stereoisomeric alkenes due to different arrangement of atoms or groups in space are referred to as
  • A
    chain isomers
  • B
    position isomers
  • C
    constitutional isomers
  • D
    geometric isomers
    Correct
14
One method of producing ethylene is by the reaction. This is an example of _______ reaction
Question 14 figure 1
  • A
    Substitution reaction
  • B
    Elimination reaction
    Correct
  • C
    Addition reaction
  • D
    Rearrangement reaction
15
Boiling point of isomeric branched chain alkenes is
  • A
    same boiling point as straight chain alkenes
  • B
    same boiling point as straight chain alkenes except optical isomers
  • C
    lower boiling point than straight chain alkenes
    Correct
  • D
    higher boiling point than straight chain alkenes