Two organic compounds X and Y on analysis gave the same percentage composition namely; C = (12/13) × 100% and H = (1/13) × 100%. However, compound X decolourises bromine water while compound Y does not. The two compounds X and Y may be respectively 

• acetylene and ethylene

• acetylene and benzene

• ethylene and benzene

• toluene and benzene

For preparing an alkane, a saturated solution of sodium or potassium salt of a carboxylic acid is subjected to

• hydrolysis

• electrolysis

• oxidation

• hydrogenation

The reaction of  with HBr gives predominantly

An organic compound with molecular formula C₆H₁₂ upon ozonolysis give only acetone as the product. The compound is

• 2,3-dimethyl-1-butene

• 3-hexane

• 2-hexene

• 2,3-dimethyl-2-butene

Which one of the following carbanions is the least stable?

• CH₃CH₂^-

• CH₃^-

• (CH₃)₃C^-

• HC≡C^-

An aromatic hydrocarbon with empirical formula C₅H₄ on treatment with concentrated H₂SO₄ gave a monosulphonic acid. 0.104 g of the acid required 10 mL of $\frac{\mathrm{N}}{20}$ NaOH for complete neutralisation. The molecular formula of hydrocarbon is 

• C₅H₄

• C₁₀H₈

• C₁₅H₁₂

• C₂₀H₁₆

An alkene having the molecular formula C₉H₁₈ on ozonolysis gives 2, 2-dimethyl propanal and 2-butanone. The alkene is :

• 2, 2, 2-trimethyl-3-hexene

• 2, 2, 6-trimethyl-3-hexane

• 2, 3, 4-trimethyl-2-hexene

• 2, 2, 4-trimethyl-3-hexene

Observe the following reactions and predict the nature of A and B:

• A and B both are 

• A and B both are 

• A is  and B is 

• A is  and B is 

339.

Nitration of aniline in strongly acidic medium, result in the formation of m-nitroaniline also. This is because :

• amino group is meta orienting during electrophilic substitution reaction

• nitro group goes always to the meta position irrespective of the substituents

• nitration of aniline is a nucleophilic substitution reaction in strongly acidic medium

• in strongly acidic conditions aniline is present as anilinium ion

How many σ and Π bonds are present in toluene?

• 3Π + 8σ

• 3Π + 10σ

• 3Π + 15σ

• 6Π + 3σ