Organic Chemistry Some Basic Principles CBSE Questions & Answers

Organic Chemistry Some Basic Principles

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

Questions & Answers

1
Hybridisation in methane \(\left( {{\text{CH4}}} \right),\) ethene \(\left( {{\text{C2H4}}} \right),\) ethyne (C2H2) involves s and p orbitals. Choose the correct hybrid orbitals in the options given below for \({\text{C}}{{\text{H}}_{\text{4}}},{\text{ }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}\) and, \({{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}\) respectively
  • A
    \({\text{s}}{{\text{p}}^{\text{2}}},{\text{sp }},{\text{ s}}{{\text{p}}^{\text{3}}}\)
  • B
    \({\text{s}}{{\text{p}}^{\text{3}}},{\text{sp}},{\text{ s}}{{\text{p}}^{\text{2}}}\)
  • C
    \({\text{s}}{{\text{p}}^{\text{3}}},{\text{s}}{{\text{p}}^{\text{2}}},{\text{sp}}\)
    Correct
  • D
    \({\text{sp }},{\text{ s}}{{\text{p}}^{\text{3}}},{\text{ s}}{{\text{p}}^{\text{2}}}\)
2
Change in hybridisation affects the carbon’s and the organic compound’s
  • A
    bond enthalpy
  • B
    electronegativity
    Correct
  • C
    bond strength
  • D
    bond length
3
Condense the following complete structural formula given below. Choose the appropriate answer given below
Question 3 figure 1
  • A
    \({\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{CH}} = {\text{ C}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{3}}}\)
  • B
    \({\text{C}}{{\text{H}}_{\text{2}}}{\text{C}}{\left( {{\text{C}}{{\text{H}}_{\text{3}}}} \right)_{\text{3}}}\)
  • C
    \({\text{C}}{{\text{H}}_{\text{3}}}{\text{CH}} = {\text{CH}}{\left( {{\text{C}}{{\text{H}}_{\text{2}}}} \right)_{\text{3}}}{\text{C}}{{\text{H}}_{\text{3}}}\)
    Correct
  • D
    \({\left( {{\text{C}}{{\text{H}}_{\text{2}}}} \right)_{\text{3}}}{\text{CH}}\left( {{\text{C}}{{\text{H}}_{\text{3}}}} \right){\text{CH}}{\left( {{\text{C}}{{\text{H}}_{\text{3}}}} \right)_{\text{2}}}\)
4
2-bromo butane can be represented in various ways. Choose the incorrect one from the following
  • A
    Option A
  • B
    Option B
  • C
    Option C
    Correct
  • D
    Option D
5
Which of the following is the correct IUPAC name?
  • A
    4, 4-Bis(methyl)-3-ethylheptane
  • B
    3-Ethyl-4, 4-dimethylheptane
  • C
    4, 4-Dimethyl-3-ethylheptane
    Correct
  • D
    5-Ethyl-4, 4-dimethylheptane
6
Write the state of hybridisation of carbon in \({{\text{H}}_{\text{2}}}{\text{C}} = {\text{O}}\).
  • A
    \({\text{s}}{{\text{p}}^{\text{3}}}\)hybridised carbon, trigonal
  • B
    \({\text{s}}{{\text{p}}^{\text{3}}}\) hybridised carbon, tetrahedral
  • C
    \({\text{s}}{{\text{p}}^{\text{2}}}\)hybridised carbon, trigonal planar
    Correct
  • D
    sp hybridised carbon, linear
7
The IUPAC name for
Question 7 figure 1
  • A
    1-Chloro-4-methyl-2-nitrobenzene
    Correct
  • B
    m-Nitro-p-chlorotoluene
  • C
    2-Chloro-1-nitro-5-methylbenzene
  • D
    1-Chloro-2-nitro-4-methylbenzene
8
In a π (pi) bond formation, is necessary for one of the below criteria. Choose the appropriate one.
  • A
    parallel orientation of the two p orbitals on adjacent atoms
    Correct
  • B
    pentagonal orientation of the two p orbitals on adjacent atoms
  • C
    trigonal orientation of the two p orbitals on adjacent atoms
  • D
    planar orientation of the two p orbitals on adjacent atoms
9
In general, in the molecules containing multiple bonds,_____ provide the most reactive centres. Choose the most appropriate one.
  • A
    hyperconjugation
  • B
    \(\sigma\) bond
  • C
    \(\Pi \) bonds
    Correct
  • D
    p orbitals
10
Which of the following compounds contain all the carbon atoms in the same hybridisation state?
  • A
    $CH_2$ = CH—C ≡ CH
  • B
    $CH_3$—C ≡ C— $CH_3$
  • C
    $CH_2$ = C = $CH_2$
  • D
    H—C ≡ C—C ≡ C—H
    Correct
11
Delocalisation of σ electrons of C -H bond of an alkyl group directly attached to an atom of unsaturated system or to an atom with an unshared p orbital is called :
  • A
    Elimination reactions
  • B
    Substitution reactions
  • C
    Hyperconjugation
    Correct
  • D
    Rearrangement reactions
12
Hyperconjugation in an organic compound is a
  • A
    stabilizing interaction
    Correct
  • B
    destabilizing interaction
  • C
    temporary effect
  • D
    Delocalisation of σ electrons of C -C bond of an alkyl group
13
Covalent bonds are formed with other carbon atoms due to
  • A
    coordination
  • B
    substitution
  • C
    catenation
    Correct
  • D
    ionisation
14
Wohler synthesised an organic compound from an inorganic compound, ammonium cyanate.in the presence of heat. What is that compound? Choose among the following options.
  • A
    \({\text{HOCH}}{\left( {{\text{CN}}} \right)_{\text{2}}}\)
  • B
    ammonia
  • C
    ammonium hydroxide
  • D
    urea
    Correct
15
Straight or branched chain compounds, for example, the below ones are called
Question 15 figure 1
  • A
    aliphatic compounds
    Correct
  • B
    closed chain compounds
  • C
    aliphatic cyclic compounds
  • D
    alicyclic compounds