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CBSE

Subject

Chemistry
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NEET Chemistry : Hydrocarbons

Multiple Choice Questions

1.

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



2.

Find out the correct stereoisomeric product for the following reaction,

  • d-form

  • l- from

  • meso-form

  • racemic mixture



3.

Propyne on passing through red hot copper tube forms

  • benzene

  • toluene

  • mesitylene

  • None of these



4.

The above reaction is known as

  • aromatisation

  • pyrolysis

  • isomerisation

  • oxidation



5.

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



6.

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

  • Ethene

  • Propylene

  • 3-methyl but-1-ene

  • 1-butene



7.

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



8.

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

  • 60°, 0°

  • 0°, 60°

  • 60°, 180°

  • 180°, 60°



9.

On warming with silver powder, chloroform is converted into

  • acetylene

  • hexachloroethane

  • 1, 1, 2, 2-tetrachloroethane

  • ethylene



10.

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

  • Neo-pentyl

  • Tert-butyl

  • Iso-propyl

  • Ethyl



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