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
In which of the following, functional group isomerism is not possible?
  • A
    Alkyl halides
    Correct
  • B
    Cyanides
  • C
    Aldehydes
  • D
    Alcohols
2
The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is:
  • A
    Distillation under reduced pressure
  • B
    Crystallisation
  • C
    Distillation
  • D
    Steam distillation
    Correct
3
During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results?
  • A
    Thin layer chromatography
    Correct
  • B
    Solvent extraction
  • C
    Column chromatography
  • D
    Distillation
4
The principle involved in paper chromatography is
  • A
    Partition
    Correct
  • B
    Adsorption
  • C
    Volatility
  • D
    Solubility
5
In which of the following compounds the carbon marked with asterisk is expected to have greatest positive charge?
  • A
    \({\text{ }}*{\text{ C}}{{\text{H}}_{\text{3}}}--{\text{ C}}{{\text{H}}_{\text{2}}}---{\text{Cl}}\)
    Correct
  • B
    \(*CH3 - CH2 - Mg + C{l^ - }\)
  • C
    \(*{\text{C}}{{\text{H}}_{\text{3}}}--{\text{ C}}{{\text{H}}_{\text{2}}}---{\text{Br}}\)
  • D
    \(*{\text{C}}{{\text{H}}_{\text{3}}}--{\text{ C}}{{\text{H}}_{\text{2}}}---{\text{ C}}{{\text{H}}_{\text{3}}}\)
6
\({{\text{C}}_{\text{4}}}{{\text{H}}_{{\text{1}}0}}{\text{O}}\) represents methoxypropane \(\left( {{\text{C}}{{\text{H}}_{\text{3}}}{\text{O}}{{\text{C}}_{\text{3}}}{{\text{H}}_{\text{7}}}} \right)\) and ethoxyethane \(\left( {{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}{\text{O }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}} \right)\)
  • A
    Functional group isomerism
  • B
    Metamerism
    Correct
  • C
    isomerism
  • D
    Stereoisomerism
7
The organic compound given below is one of the four options given below. Choose the most appropriate one.
Question 7 figure 1
  • A
    ring compound
  • B
    aromatic heteroyclic compound
  • C
    aliphatic heteroyclic compound
    Correct
  • D
    alicyclic compound
8
The order of decreasing priority for some functional groups in the naming of an organic compound is:
  • A
    \( - {\text{CON}}{{\text{H}}_{\text{2}}},{\text{ }} - {\text{CN}}, - {\text{HC}} = {\text{O}},{\text{ }} > {\text{C}} = {\text{O}},{\text{ }} - {\text{OH}},{\text{ }} - {\text{N}}{{\text{H}}_{\text{2}}},{\text{ }} - {\text{COOR }}\left( {{\text{R}} = {\text{alkyl group}}} \right),{\text{ }} - {\text{COCl}}\)
  • B
    \( - {\text{COCl}},{\text{ }} - {\text{CON}}{{\text{H}}_{\text{2}}},{\text{ }} - {\text{CN}}, - {\text{HC}} = {\text{O}},{\text{ }} > {\text{C}} = {\text{O}},{\text{ }} - {\text{OH}},{\text{ }} - {\text{N}}{{\text{H}}_{\text{2}}},{\text{ }} - {\text{COOR }}\left( {{\text{R}} = {\text{alkyl group}}} \right)\)
  • C
    \( - {\text{COOR }}\left( {{\text{R}} = {\text{alkyl group}}} \right),{\text{ }} - {\text{COCl}},{\text{ }} - {\text{CON}}{{\text{H}}_{\text{2}}},{\text{ }} - {\text{CN}}, - {\text{HC}} = {\text{O}},{\text{ }} > {\text{C}} = {\text{O}},{\text{ }} - {\text{OH}},{\text{ }} - {\text{N}}{{\text{H}}_{\text{2}}}\)
    Correct
  • D
    \( - {\text{CN}}, - {\text{HC}} = {\text{O}},{\text{ }} > {\text{C}} = {\text{O}},{\text{ }} - {\text{OH}},{\text{ }} - {\text{N}}{{\text{H}}_{\text{2}}},{\text{ }} - {\text{COOR }}\left( {{\text{R}} = {\text{alkyl group}}} \right),{\text{ }} - {\text{COCl}},{\text{ }} - {\text{CON}}{{\text{H}}_{\text{2}}}\)
9
State the nucleophile among the following molecules/ions
Question 9 figure 1
  • A
    Option A
  • B
    Option B
  • C
    Option C
    Correct
  • D
    Option D
10
State the electrophile among the following molecules/ions
Question 10 figure 1
  • A
    Option A
    Correct
  • B
    Option B
  • C
    Option C
  • D
    Option D
11
In organic compounds, when homolytic cleavage takes place, one of the electrons of the shared pair in a covalent bond goes with each of the bonded atoms. This results in the formation of
  • A
    carbanions
  • B
    carbonium ion
  • C
    free radicals
    Correct
  • D
    a sextet electronic structure
12
The following compounds are called:
Question 12 figure 1
  • A
    aromatic hetrocyclic compounds.
    Correct
  • B
    Alicyclic compounds
  • C
    aliphatic heteroyclic compounds
  • D
    non benzenoid compounds
13
In which C-C bond of \({\text{CH3CH2CH2Br}},\)the inductive effect is expected to be the least?
  • A
    bond between carbon-3 and Br
  • B
    bond between carbon-3 and hydrogen
    Correct
  • C
    bond between carbon-2 and hydrogen
  • D
    bond between carbon-1 and hydrogen
14
To separate mixtures into their components, and also to test the purity of ompounds, the popularly used technique is :
  • A
    Chromatography
    Correct
  • B
    Differential Extraction
  • C
    fractional distillation
  • D
    steam distillation
15
The elements present in an organic compound are converted from covalent form into the ionic form by fusing the compound with sodium metal. This test is called
  • A
    Iodoform test
  • B
    Lassaigne’s test
    Correct
  • C
    Feulgen test
  • D
    Fehling’s test