The degree of unsaturation of C₆H₆ and butyne-2 respectively are

• 6 and 3

• 6 and 2

• 2 and 6

• 4 and 2

A salt producing hydrocarbon among these compounds is

• ethane

• methane

• ethene

• ethyne

Octane numberis zero for

• n-octane

• iso-octane

• n-heptane

• iso-heptane

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

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

427.

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