51.

An organic compound 'A' burns with a sooty flame. It is negative towards Tollen's reagent test and positive for Borsche's reagent test. The compound 'A' is

• acetophenone

• acetone

• salicylic acid

• benzaldehyde

HCHO was treated with a reagent X. The product formed upon hydrolysis in the presence of an acid gave C₂H₅OH. The reagent X is

• alcoholic KOH

• alcoholic KCN

• CH₃MgI

• aqueous KOH

Benzylamine is a stronger base than aniline because

• the lone pair of electrons on the nitrogen atom in aniline is delocalised

• the lone pair of electrons on the nitrogen atom in aniline is not involved in resonance

• benzylamine has a higher molecular mass than aniline

• the lone pair of electrons on the nitrogen atom in benzylamine is delocalised

The relative acidic strengths of benzoic acid, o-toluic acid and p-toluic acid is of the decreasing order

• o-toluic acid > p-toluic acid > benzoic acid

• p-toluic acid > benzoic acid > o-toluic acid

• o-toluic acid > benzoic acid > p-toluic acid

• p-toluic acid > o-toluic acid > benzoic acid

A given sample of milk turns sour at room temperature (27°C) in 5 h. In a refrigerator at - 3°C, it can be stored 10 times longer. The energy of activation for the souring of milk is

• 2.303 × 5 R kJ mol^-1

• 2.303 × 3 R kJ mol^-1

• 2.303 × 2.7 R kJ mol^-1

• 2.303 × 10 R kJ mol^-1

Sucrose is not a reducing sugar since

• it contains no free aldehyde or keto group adjacent to, -CHOH group

• it is built up of a fructose unit

• it is optically active

• it is chemically stable

Dialysis can be used to separate

• protein and starch

• glucose and protein

• glucose and NaCl

• glucose and fructose

Which one of the following is not formed when a mixture of methyl bromide and bromobenzene is heated with sodium metal in the presence of dry ether?

• diphenyl

• propane

• toulene

• ethane

Power alcohol is a mixture of

• 80% petrol + 20% ethanol + small quantity of benzene

• 80% ethanol + 20% benzene + small quantity of petrol

• 50% Petrol + 50% ethanol + small quantity of benzene

• 80% petrol + 20% benzene + small quantity of ethanol

Identify 'C' in the following

• ethanol

• propanone

• cumene hydroperoxide

• water