The conditions for aromaticity is :

• molecule must have clouds of delocalised $\mathrm{\pi }$ electrons

• molecule must contain (4n + 2) $\mathrm{\pi }$ electrons

• both (a) and (b)

• None of the above

Allene (C₃H₄) contains :

• one double bond, one triple bond and one single bond

• one triple and two double bonds

• two triple and one double bond

• two double and four single bond

Which of the following is correct number of carbon atom present as the constituent of kerosene oil ?

• C₁₀ - C₁₆

• C₄ - C₆

• C₈ - C₁₆

• C₁₂ - C₁₈

LPG mainly contains :

• ethyne

• butane

• methane

• ethane

Alkyl halides react with dialkyl copper reagents to give

• alkenyl halides

• alkanes

• alkyl copper halides

• alkenes

Amongst the following compounds, the optically active alkane having lowest molecular mass is

• CH₃-CH₂-CH₂-CH₃

• CH₃-CH₂-CH(CH₃)-CH₃

• 

• CH₃-CH₂-C≡CH

207.

KMnO₄ (acidic/alkaline) is not decolourised by

• Mohr salt

• Oxalic acid

• Benzene

• Propene

When acetylene is passed through dil H₂SO₄, in presence of HgSO₄ the compound formed is

• ether

• acetaldehyde

• acetic acid

• ketone

CH₃CH₂CH₃ $\stackrel{400-600°\mathrm{C}}{\to }$ X + Y

X and Y are

• hydrogen

• methane

• hydrogen

• ethylene

How many $\mathrm{\pi }$ bonds are present in naphthalene?

• 4

• 5

• 6

• 7