ECAT Pre Engineering Chemistry Chapter 22 MCQ Test With Answer

3 moles of ethanol react with one mole of phosphorus tribromide to from 3 moles of bromoethane and on mole of X. Which of the following is X?

• H₃PO₄ A
• H₃PO₂ B
• HPO₃ C
• H₃PO₃ D

Which is not the enzyme involved in the preparation of ethyl alcohol by fermentation of starch

• Diastase A
• Maltase B
• Zymase C
• Invertase D

Dehydration of an alcohol at 180°

• Alkene A
• Ether B
• Ester C
• An hydride D

Which compound is called a universal solvent?

• H₂O A
• CH₃OH B
• C₂H₅OH C
• CH₃----O---CH₃ D

A compound is soluble in conc. H₂SO₄, it does not decolourise bromine in carbon tetrachloride but is oxidized by chromic anhydride in aqueous sulphuric acid within two seconds, turning orange solution to blue, green and then opaque. The original compound is

• Primary alcohol A
• Tertiary alcohol B
• alkene C
• ether D

The organic compounds which are derivative of hydrocarbons of oxygen are:

• Carbohydrates A
• Phenols B
• Alcohals C
• All of these D

Which of the following statements is correct?

• Phenol is less acidic than ethyl alcohol A
• Phenol is more acidic than ethanol B
• Phenol is more acidic than carbonic acid C
• Phenol is more acidic than CH₃COOH D

Diethyl ether is obtained by Williamsons synthesis using

• Ethanol + Na + C₂H₅Br A
• Ethanol + Mg + C₂H₅Br B
• Methanol + Na + CH₃Br C
• Methanol + Mg + CH₃Br D

Ethyl alcohol on oxidation with K₂Cr₂O₇gives

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

which enzyme is not involved in the fermentation of starch ?

• Diastase A
• Zymase B
• Urease C
• Invertase D

Rectified spirit contains alcohol about

• 80% A
• 85% B
• 90% C
• 95% D

Which is a reagent for Lucas test

• ZnCl₂+ Conc. HCl A
• Zn B
• Na C
• Br D

How many alcohol (including both structural isomers and stereoisomers) can have the molecular formula C₄H₁₀O

• 3 A
• 4 B
• 5 C
• 6 D

Derivative of water is:

• Alcohals A
• Phenols B
• Either C
• Phenol D

The strongest acid among the following aromatic compound is

• Ortho-nitrophenol A
• Para-chlorophenol B
• Para-nitrophenol C
• Meta-nitrophenol D

• 1-bromobutane A
• 2-bromobutane B
• 1-bromo-2-methyl propane C
• 2-bromo-2-methyl propane D

Which one of the following correctly describes the acid properties of phenol

• Stronger than HCI A
• Stronger than carboxylic acid B
• An acid stronger than carbonic acid C
• An acid weaker than carboxylic acid D

Methyl alcohol is not used

• As a solvent A
• A an anti-freezing agent B
• As a substitute for petrol C
• For denaturing of ethyl alcohol D

Grignard reagent on reaction with a ketone forms

• Tertiary alcohol A
• Secondary alcohol B
• Primary alcohol C
• Carboxylic acid D

Which more acidic?

• o-cresol A
• p-nitrophenol B
• phenol C
• m-cresol D

Ethyl alcohol may be identified by

• Ring test A
• Iodoform test B
• Tollen's test C
• Bazeyer's test D

Methyl alcohol is not used:

• As a subsitution for petrol A
• As an anti-freezing agent B
• For denating of ethyle alcohal C
• As a solvent D

Na reacts with phenol to produce

• H₂gas A
• Benzene B
• CO₂gas C
• CO gas D

A compound of the formula C₄H₁₀O_{reacts with sodium and undergoes oxidation to give a carbonyl compound which does not reduce Tollen's reagent, the original compound is}

• Diethyl ether A
• n-Butyl alcohol B
• Isobutyl alcohol C
• sec-Butyl alcohol D

The malt-sugar in the presence of yeast or invertase gives

• Fructose A
• Glucose B
• Lignin C
• Alcohol D

Which structure shows a tertiary alcohol

• CH₃CH₂OH A
• (CH₃)₂CHOH B
• (CH₃)₃COH C
• CH₂OH D

Oxidation of ter-alcohol gives:

• Aldehyde A
• Formaldehyde B
• Ketone C
• Alkens D

Which compound is more soluble in water

• C₂H₅OH A
• Benzene B
• CH₃OCH₃ C
• Hexane D

Carbolic acid is the other name for

• Methanol A
• Ethanol B
• Propanol C
• Phenol D

Alcohols react with carboxylic acid to produce the class of compounds known as

• Grignard's reagent A
• Esters B
• Amides C
• None of these D