The IUPAC name of the compound  is

• pent - 4 yn - 2- ene

• pent - 3-en - 1-yne

• pent - 2- en-4 -yne

• pent - 2- en-4 -yne

252.

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

• Ethene

• Propylene

• 3-methyl but-1-ene

• 1-butene

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

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