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

• methyl cyclobutane

• cyclopentane

• cyclobutane

• methyl cyclopentane

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 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

Benzene carbaldehyde is reacted with conc. NaOH solution to give the products A and B. The product A can be used as a food preservative and the product B is an aromatic hydroxy compound, where -OH group is linked to sp³-hybridised C-atom next to benzene ring. The products A and B respectively are

• sodium benzoate and phenol

• sodium benzoate and phenyl methanol

• sodium benzoate and cresol

• sodium benzoate and picric acid

The arrangement of following compounds.

(i) Bromomethane

(ii) Bromoform

(iii) Chloromethane

(iv) Dibromomethane

In the increasing order of their boiling point is

• III < I < IV < II

• IV < III < I < IV

• II < III < I < IV

• I < II < III < IV

An organic compound A on reduction gives compound B, which on reaction with trichloromethane and caustic potash forms C. The compound C on catalytic reduction gives N-methyl benzenamine, the compound A is,

• nitrobenzene

• nitromethane

• methanamine

• benzenamine

179.

Which of the following has highest knocking ?

• Olefins

• Branched chain olefins

• Straight chain olefins

• Aromatic hydrocarbons

Chlorination of benzene is not possible in the following reaction :

• C₆H₆ + Cl₂ $\stackrel{{\mathrm{FeCl}}_3}{\to }$

• C₆H₆ + HOCl $\stackrel{{\mathrm{H}}^{+}}{\to }$

• C₆H₆ + I-Cl $\stackrel{{\mathrm{ZnCl}}_2}{\to }$

• C₆H₆ + Cl₂ $\stackrel{{\mathrm{AlCl}}_3}{\to }$