Among the following alkenes, which one is ,the most stable?

• CH₂=CH₂

• CH₃-CH=CH₂

• CH3-CH=CH-CH₃

• (CH₃)₂C=C(CH₃)₂

In acetylene molecule, the two carbon atoms are linked by

• one sigma-bond and two pi-bonds

• two sigma-bonds and one pi-bond

• three sigma-bonds

• three pi-bonds

153.

Pick out the alkane which differs from the other members of the group

• 2,2-dimethyl propane

• pentane

• 2-methyl butane

• 2,2-dimethyl butane

On treating a mixture of two alkyl halides with sodium metal in dry ether, 2-methyl propane was obtained. The alkyl halides are

• 2-chloropropane and chloromethane

• 2-chloropropane and chloroethane

• chloromethane and chloroethane

• chloromethane and 1-chloropropane

Which one of the following statements about benzyl chloride is incorrect?

• It is less reactive than alkyl halides

• It can be oxidised to benzaldehyde by boiling with copper nitrate solution

• It is a lachrymatory liquid and answers Beilstein's test

• It gives a white precipitate with alcoholic silver nitrate

Which cycloalkane has the lowest heat of combustion per CH₂ group?

• Cyclopropane

• Cyclobutane

• Cyclopentane

• Cyclohexane

A gas decolourised by KMnO₄ solution but gives no precipitate with ammoniacal cuprous chloride is

• ethane

• methane

• ethene

• acetylene

Household gaseous fuel (LPG) mainly contains

• CH₄

• C₂H₂

• C₂H₄

• C₄H₁₀

Benzene reacts with chlorine in sunlight to give a final product

• CCl₄

• C₆H₆Cl₆

• C₆Cl₆

• C₆H₅Cl

The general formula of a cycloalkane is

• C_nH_n

• C_nH_2n

• C_nH_2n-2

• C_nH_{2n + 2}