171.

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}

The reagent used to convert an alkyne to alkene is

• Zn/HCl

• Sn/HCl

• Zn-Hg/HCl

• Pd/H₂

n-propyl bromide on treating with alcoholic KOH produces

• propane

• propene

• propyne

• propanol

The IUPAC name for tertiary butyl iodide is

• 4-iodo butane

• 2-iodo butane

• 1-iodo-3-methyl propane

• 2-iodo-2-methyl propane

The electrophile involved in the sulphonation of benzene is

• SO${}_3^{+}$

• SO${}_3^{2-}$

• H${}_3^{+}$O

• SO₃