441.

Which one of these is not true for benzene?

• It forms only one type of monosubstituted product

• There are three carbon-carbon single bonds and three carbon-carbon double bonds

• Heat of hydrogenation of benzene is less than its theoretical value

• The bond angle between carbon-carbon bonds is 120°

A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is

• 1, 1-dibromopropane

• 2, 2-dibromobutane

• 1, 2-dibromoethane

• 1, 4-dibromobutane

Which one of the following is an intermediate in the reaction of benzene with CH₃Cl in the presence of anhydrous AlCl₃?

• Cl^-

• CH${}_3^{-}$

• CH${}_3^{+}$

• 

Cycloalkane formed when 1,4-dibromopentaneis heated with sodium is

• methyl cyclobutane

• cyclopentane

• cyclobutane

• methyl cyclopentane

Methane can be converted into ethane by the reactions

• chlorination followed by the reaction with alcoholic KOH

• chlorination followed by the reaction with aqueous KOH

• chlorination followed by Wurtz reaction

• chlorination followed by decarboxylation

Least energetic conformation of cyclohexane is

• chair conformation

• boat conformation

• cis conformation

• E-Z form

An alkyl bromide (X) reacts with sodium in ether to form 4,5-dIethyl octane, the compound X is

• CH₃(CH₂)₃Br

• CH₃(CH₂)₅Br

• CH₃(CH₂)₃CH(Br)CH₃

• CH₃—(CH₂)₂—CH(Br)—CH₂—CH₃

The correct sequence of reactions to be performed to convert benzene into m-bromoaniline is

• nitration, reduction, bromination

• bromination, nitration, reduction

• nitration, bromination, reduction

• reduction, nitration, bromination

The correct statement is

• Cyclohexadene and cyclohexene cannot be isolated with ease during controlled hydrogenation of benzene

• One mole each of benzene and hydrogen when reacted gives 1/3 mole of cyclohexane and 2/3 mole unreacted hydrogen

• Hydrogenation of benzene to cyclohexane is an endothermic process

• It is easier to hydrogenate benzene when compared to cyclohexene

Number of possible alkynes with formula C₅H₈ is

• 2

• 3

• 4

• 5