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CBSE

Subject

Chemistry
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NEET Chemistry : Hydrocarbons

Multiple Choice Questions

1.

Find out the correct stereoisomeric product for the following reaction,

  • d-form

  • l- from

  • meso-form

  • racemic mixture



2.

The IUPAC name of the compound CH subscript 3 CH space equals space CHC space identical to space CH is

  • pent - 4 yn - 2- ene

  • pent - 3-en - 1-yne

  • pent - 2- en-4 -yne

  • pent - 2- en-4 -yne



3.

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

  • The eclipsed conformation of ethane is more stable than staggered conformation because eclipsed conformation has no torsional strain

  • The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain

  • The staggered conformation of ethane is more stable than eclipsed conformation because staggered conformation has no torsional strain

  • The staggered conformation of ethane is more stable than eclipsed conformation because staggered conformation has no torsional strain



4.

Dihedral angle between two methyl groups of n-butane in the gauche and anti forms are

  • 60°, 0°

  • 0°, 60°

  • 60°, 180°

  • 180°, 60°



5.

Propyne on passing through red hot copper tube forms

  • benzene

  • toluene

  • mesitylene

  • None of these



6.

Which of the following hydrocarbons is the most reactive towards addition of H2SO4?

  • Ethene

  • Propylene

  • 3-methyl but-1-ene

  • 1-butene



7.

In the reaction,

How many electron donating groups are attached with the carbon atom of unsaturated part of the product 'B' ?

  • Two

  • Three

  • Four

  • None of these



8.

On warming with silver powder, chloroform is converted into

  • acetylene

  • hexachloroethane

  • 1, 1, 2, 2-tetrachloroethane

  • ethylene



9.

The above reaction is known as

  • aromatisation

  • pyrolysis

  • isomerisation

  • oxidation



10.

Hyperconjugation is most useful for stabilising which of the following carbocations?

  • Neo-pentyl

  • Tert-butyl

  • Iso-propyl

  • Ethyl



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