511.

Find out the correct stereoisomeric product for the following reaction,

• d-form

• l- from

• meso-form

• racemic mixture

The above reaction is known as

• aromatisation

• pyrolysis

• isomerisation

• oxidation

Propyne on passing through red hot copper tube forms

• benzene

• toluene

• mesitylene

• None of these

On warming with silver powder, chloroform is converted into

• acetylene

• hexachloroethane

• 1, 1, 2, 2-tetrachloroethane

• ethylene

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

• Neo-pentyl

• Tert-butyl

• Iso-propyl

• Ethyl

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

• 60°, 0°

• 0°, 60°

• 60$°$, 180°

• 180°, 60°

The homologue of ethyne is

• C₂H₂

• C₂H₆

• C₃H₈

• C₃H₄

Which one of the following alkenes will react faster with H₂ under catalytic hydrogenation conditions?

(R = Alkyl substituent)

The least energetic conformation of cyclohexane is:

• Boat form

• Half chair form

• Chair form

• Twisted form

By which one of the following compounds both CH₄ and CH₃ - CH₃ can be prepared in one step?

• CH₃I

• CH₃OH

• CH₃CH₂I

• C₂H₅OH