JEE Questions for Chemistry Hydrocarbons Quiz 6 - MCQExams.com

The conditions for aromaticity is
  • molecule must have clouds of delocalised π-electrons
  • molecule must contain (4n +π-electrons
  • Both (and (2)
  • None of the above
When chlorine is passed through warm benzene in presence of the sunlight, the product obtained is
  • benzotrichloride
  • chlorobenzene
  • gammexane
  • DDT
Aromatic compound among other things should have a π-electron cloud containing (4n +π-electrons where, n cannot be
  • 1/2
  • 3
  • 2
  • 1
Isomers of hexane, based on their branching can be divided into three distinct classes as shown in the figure. The correct order of their boiling point is
Chemistry-Hydrocarbons-4725.png
  • I > II > III
  • III > II > I
  • II > III > I
  • III > I > II
Which of the following is correct order according to boiling point?
  • n-pentane < n-hexane < 2,3-dimethyl butane
  • n-pentane < 2,3-dimethyl butane < n-hexane
  • 2,3-dimethyl butane < n-hexane < n-pentane
  • n-hexane < 2,3-dimethyl butane < n-pentane
The number of optically active products obtained from the complete ozonolysis of the given compound
Chemistry-Hydrocarbons-4727.png
  • 0
  • 1
  • 2
  • 4

Chemistry-Hydrocarbons-4728.png

  • Chemistry-Hydrocarbons-4729.png
  • CH3 —CH2 —CH2 CHO
  • CH3 —CH2 —CH2 —COOH
  • None of the above
Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?
  • Tertiarybutyl chloride
  • Neo-pentane
  • Iso-hexane
  • Neo-hexane
Which of the following is a conjugated diene?
  • CH3 CH=C=CHCH3
  • CH2= CHCH2 CH=CH2
  • CH2=CHCH2 CH2 CH=CH2

  • Chemistry-Hydrocarbons-4731.png
Ozonolysis of an organic compound A produces acetone and propionaldehyde in equimolar mixture. Identify A from the following compounds.
  • 2 -methyl- 1-pentene
  • 1-pentene
  • 2-pentene
  • 2 -methyl-2-pentene
Identify B and D in the following sequence of reactions.
Chemistry-Hydrocarbons-4732.png
  • Methanol and bromoethane
  • Ethyl hydrogen sulphate and alcoholic KOH
  • Ethyl hydrogen sulphate and aqueous KOH
  • Ethanol and alcoholic KOH
Which compound does not give precipitate with ammoniacal silver nitrate solution?

  • Chemistry-Hydrocarbons-4734.png
  • 2)
    Chemistry-Hydrocarbons-4735.png

  • Chemistry-Hydrocarbons-4736.png

  • Chemistry-Hydrocarbons-4737.png
According to Markownikoff s rule, what will be the major product of reaction,
Chemistry-Hydrocarbons-4738.png

  • Chemistry-Hydrocarbons-4739.png
  • 2)
    Chemistry-Hydrocarbons-4740.png

  • Chemistry-Hydrocarbons-4741.png

  • Chemistry-Hydrocarbons-4742.png
When acetylene is passed through dil. H2 SO4 in of HgSO4 , the compound formed is
  • ether
  • acetaldehyde
  • acetic acid
  • ketone

Chemistry-Hydrocarbons-4744.png

  • Chemistry-Hydrocarbons-4745.png
  • 2)
    Chemistry-Hydrocarbons-4746.png

  • Chemistry-Hydrocarbons-4747.png

  • Chemistry-Hydrocarbons-4748.png
Thermal decomposition of
Chemistry-Hydrocarbons-4749.png

  • Chemistry-Hydrocarbons-4750.png
  • 2)
    Chemistry-Hydrocarbons-4751.png

  • Chemistry-Hydrocarbons-4752.png

  • Chemistry-Hydrocarbons-4753.png
The hydrocarbon which can react with sodium in liquid ammonia is
  • CH3 CH2CH2 C≡CCH2CH2CH3
  • CH3CH2C≡CH
  • CH3 CH=CHCH3
  • CH3 CH2 C≡CCH2 CH3
The treatment of CH3Mg X with CH3C≡C— H produces
  • CH3—CH=CH2
  • CH3C≡C—CH3

  • Chemistry-Hydrocarbons-4754.png
  • CH4
What are X and Y respectively in the following reaction?
Chemistry-Hydrocarbons-4755.png
  • Na/NH3 (liq.) and Pd/BaSO4 + H2
  • Ni/140°C and Pd/BaSO4 + H2
  • Ni/140°C and Na/NH3 (liq.)
  • Pd/BaSO4 + H2 and Na/NH3 (liq.)
An alkene on vigorous oxidation with KMnO4 gives only acetic acid. The alkene is
  • CH3CH2CH=CH2
  • CH3CH=CHCH3
  • (CH3)2C=CH2
  • CH3CH=CH2
Oxidation of 1-butene with hot KMnO4 solution produces
  • CH3CH2COOH + HCOOH
  • CH3CH2COOH + CO2
  • CH3COOH + CO2
  • (CH3)2C=O + CO2
Which one of the following compounds will react with methyl magnesium bromide?
  • CH3 CH2CH2 CH2 CH3
  • CH3CH= CH —CH=CH2
  • CH3 —C≡ C—CH2CH3
  • CH3CH2CH2C≡ CH
Ammoniacal cuprous chloride will give red precipitate with which one of the following ?
  • CH3 —C≡C—CH3
  • CH3 — CH=CH2
  • CH3 —C≡CH
  • CH3 —CH=CH—CH3
Which one of the following gives, on ozonolysis, both aldehydes and ketones ?
  • Me2 C=CHMe
  • Me2C=CMe2
  • MeCH2—C(Me) =CMe2
  • MeCH(Me)—CH=CHMe
A compound X on ozonolysis followed by reduction gives an aldehyde C2H4O and 2-butanone. Compound X is
  • 3-methyl pentene-2
  • 3-methyl pentene-3
  • 3-methyl hexene-3
  • 3-ethyl pentene-3
Select the reagent for the following reaction,
Chemistry-Hydrocarbons-4758.png
  • SeO2
  • O3, Zn / H2O
  • O3, H2O2—CH3 COOH
  • PCC
An alkyne combines with a conjugated diene to give an unconjugated cycloalkadiene. The most likely title of this reaction is
  • Schotten-Baumann reaction
  • Hofmann-bromamide reaction
  • Pinacol-Pinacolone rearrangement
  • Diels-Alder reaction
A hydrocarbon of molecular formula C6 H10 reacts with sodamide and the same on ozonolysis followed by hydrogen peroxide oxidation gives two molecules of carboxylic acids, one being optically active. Then, the hydrocarbon may be
  • 1-hexyne
  • 3-hexyne
  • 3-methyl-1-pentyne
  • 3,3-dimethyl-l-butyne
When C2 H2 , CH4 and C2 H4 passes through a test tube which have ammoniacal Cu2Cl2, find out which gas comes out unaffected from test tube ?
  • C2 H2 and CH4
  • C2 H2 and C2 H4
  • C2 H4 and CH4
  • C2 H2

Chemistry-Hydrocarbons-4760.png
  • CH3CH2OH
  • CH3 — O—CH3
  • CH3 CH2CHO
  • CH2 = CHOH
0:0:1


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