ECAT Pre Engineering Chemistry Chapter 24 MCQ Test With Answer

An artificial smell of banana is produced in many articles y using esters which of the following is that

• Amyl acetate A
• Isoamyl valerate B
• Octyl acetate C
• Methyl butyrate D

The acid present in the stings of bees and wasps in

• Acetic acid A
• Formic acid B
• Formalin C
• Formaldehyde D

A peptide having molecular mass upto 10,000 is called a

• Vitamin A
• Protein B
• Polypeptide C
• Dipetide D

The order of decreasing ease of reaction with ammonia is

• Anhydrides, esters, ethers A
• Anhydrides, ethers, esters B
• Ethers, anhydrides, esters C
• Esters, ethers, anhydrides D

Amiino acids are building blocks of:

• Protein A
• Carbohydrates B
• Lipids C
• Fats D

General formula of aliphatic carboxylic acids:

• R---OH A
• R----COH B
• R----CO---R C
• RCOOH D

The acid present in vinegar is

• CH₃COOH A
• HCI B
• H₂SO₄ C
• HCOOH D

• Alkyl A
• Alkyl nitrile B
• Cyanogens C
• Amine D

Formic Acid is obtained from Red out by:

• Distillation A
• Crystallization B
• Filtration C
• sublimation D

Carboxylic acids are more acidic than pehnol and alcohol because of

• Intermolecular hydrogen bonding A
• Formation of dimmers B
• Highly acidic hydrogen C
• Resonance stabilization of their conjugate base D

• RCH(CH₃)CO₂H + CH₃OH A
• RCH(CH₃)CO₂H + HCO₂H B
• RCH(CH₃)OH + CO₂ C
• RCH(CH₃)OH + HCO₂H D

When a carboxylic acid reacts with a metal ______ gas is evolved

• H₂ A
• CO₂ B
• CI₂ C
• None of these D

The acid showing salt like character in aqueous solution is

• Acetic acid A
• Benzoic acid B
• Formic acid C
• α - Aminoacetic acid D

Carboxylic acids having carboxyl group one is called:

• Mono carboxylic acid A
• Di-carboboxylic acid B
• Tri carboxilic acid C
• Tetra carboxylic acid D

A carboxylic acid with one caboxyl group:

• Monocarboxylic acid A
• Dicarboxylic acid B
• Tricarboxylic acid C
• Polycarboxylic acid D

Hydrolysis of trichloromethane with aqueous KOH gives

• Potassium formate A
• Acetylene B
• Chloral C
• Methanol D

In preparation medhod of carboxylic acids from alkyl halides always carboxylic acid formed which have carbon atoms:

• One less than in R----X A
• One more than in R---X B
• Equal to R---X C
• Double to R----X D

Acetic anhydride is obtained form acetyl chloride by the reaction of

• P₂O₅ A
• H₂SO₄ B
• CH₃COONa C
• CH₃COCH₃ D

Vinegar is dilute solution of:

• Acitic acid A
• Formic acid B
• Butyric acid C
• Propionic acid D

Acetic Acid is obtained from:

• Red out A
• Vinegar B
• Butter C
• Milk D

Of the following four reactions, formic acid and acetic acid differ in which respect?

• Replacement of hydrogen by sodium A
• Formation of ester with alcohol B
• Reduction of Fehling solution C
• Blue litmus reaction D

Which of the following compounds on boiling with KMnO₄(alk) and subsequent acidification will not give benzoic acid?

• Benzyl alcohol A
• Acetophenone B
• Anisole C
• Toluene D

Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane. the easter is

• Ethyl methonoate A
• Methyl ethanoate B
• Propylamine C
• Ethylamine D

• It decolourises aqueous bromine rapidly A
• It is insoluble in water B
• It reduces Fehling's reagent C
• Two molecules react with each other in the presence of a strong acid D

From the following values of dissociation constants of four acids which value represents the strongest acid?

• 2 x 10^-2 A
• 0.02 x 10^-1 B
• 3 x 10^-4 C
• 2 x 10^-4 D

Lactic acid on heating with dil. H₂SO₄gives

• Acetic acid A
• Propionic acid B
• Acrylic acid C
• Formic acid D

• 
  A
• 
  B
• 
  C
• 
  D

Which one of the following has been hydroxyl and carboxylic acid groups

• Phenols A
• Picric acid B
• Phthalic acid C
• Salicylic acid D

The human body can synthesize ______ amino acids

• 1 A
• 10 B
• 20 C
• 19 D

When a carboxylic acid reacts with alcohol, it produces a new class of compounds

• Ethers A
• Esters B
• Anhydride C
• Amides D