The carbon-carbon bond length in benzene is

• in between C₂H₆ and C₂H₄

• same as in C₂H₄

• in between  C₂H₆ and C₂H₂

• in between C₂H₄ and C₂H₂

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

• The heat of hydrogenation of benzene is less than the theoretical value

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

Which one of the following conformations of cyclohexane is the least stable?

• Half-chair

• Boat

• Twisted-boat

• Chair

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

189.

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