451.

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

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 $\stackrel{{\mathrm{AlCl}}_3}{\to }$

In which of the following, homolytic bond fission takes place?

• Free radical chlorination of methane

• Addition of HBr to double bond

• Alkaline hydrolysis of ethyl chloride

• Nitration of benzene

A petroleum fraction having boiling range 70-200°C and containing 6-10 carbon atoms per molecule is called :

• natural gas

• gas oil

• gasoline

• kerosene

The conditions for aromaticity is :

• molecule must have clouds of delocalised $\mathrm{\pi }$ electrons

• molecule must contain (4n + 2) $\mathrm{\pi }$ electrons

• both (a) and (b)

• None of the above

Allene (C₃H₄) contains :

• one double bond, one triple bond and one single bond

• one triple and two double bonds

• two triple and one double bond

• two double and four single bond

Which of the following is correct number of carbon atom present as the constituent of kerosene oil ?

• C₁₀ - C₁₆

• C₄ - C₆

• C₈ - C₁₆

• C₁₂ - C₁₈