ECAT Pre Engineering Chemistry Chapter 22 MCQ Test With Answer

which enzyme is not involved in the fermentation of starch ?

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

Which compound is more soluble in water?

• C₂H₅OH A
• C₅H₅OH B
• CH₃OCH₃ C
• n-Hexanol D

Ethyl alcohol on oxidation with K₂Cr₂O₇gives

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

Which isomers of C₅H₁₁OH gives, on dehydration, the greatest number of different alkenes

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following process is employed to convert alkyl halide into alcohol?

• Addition A
• Substitution B
• Dehydrohalogenation C
• Molecular rearrangement D

The strongest acid among the following aromatic compound is

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

Alcohol reacts with halogen acid to produce

• Alkyl halides A
• Aldelydes B
• Ketones C
• Alkanes D

Which the increase in carbon number of solubility of an alcohol

• Increases A
• Decreases B
• Remains unaffected C
• None of these D

Grignard reagent on reaction with a ketone forms

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

Ethylene reacts will 1% cold alkaline KMnO₄to give

• Oxalic acid A
• Acetone B
• Ethylene glycol C
• Formaldehyde D

Nitration of phenol gives

• o-nitrophenol A
• p-nitrophenol B
• m-nitrophenol C
• Both o and p-nitrophenol D

Ethanol can be converted into ethanoic acid by

• Hydrogenation A
• Hydration B
• Oxidation C
• Fermentation D

According to Lewis concept ethers behave as:

• Acid A
• Base B
• Acid as well as a base C
• None of them D

Which compound is called a universal solvent?

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

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

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

Phenol is more readily soluble in

• Dil. HCl A
• Both NaOH and HCl B
• NaOH sol C
• Sodium bicarbonate solution D

Which one is used as a fuel for internal combustion engines in many European countries and Brazil

• C₂H₅OH A
• CH₃OH B
• CH₃COOH C
• C₂H₂ D

Methanol and ethanol can be distinguished by

• Iodoform test A
• Iucas test B
• Dichromate/H₂SO₄oxidation test C
• Flame test D

Phenol is also known as

• Acetic acid A
• Carbolic acid B
• Tararic acid C
• Trichloroacetic acid D

Derivative of water is:

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

On heating glycerol with conc. Sulphuric acid a compound with unpleasant odour is obtained. The compound is

• Methyl alcohol A
• Formic acid B
• Prop-2-enal C
• Glycerol sulphate D

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

Hydrolytic coversion of sucrose into glucose and fructose is known as

• Induction A
• Inversion B
• Insertion C
• Inhibition D

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 compound shows hydrogen bonding

• C₂H₆ A
• C₂H₅CI B
• CH₃-O-CH₃ C
• C₂H₅OH D

Ethanol is prepared in Pakistan form fermentation of:

• Starch A
• Sugar B
• Glucose C
• Molasses D

What will react differently with the two isomeric pentols, (CH₃)₃CCH₂OH and (CH₃)₂CH CH₂CH₂OH

• Acidified (aq) KMnO₄ A
• Concentrated H₂SO₄ B
• PCl C
• Sodium D

In Dow's method, phenol can be made from

• Chlorobenzene A
• Benzene B
• Toluene C
• Benzene sulphonic acid D

Rectified spirit contains alcohol about:

• 80% A
• 85% B
• 90% C
• 95% D

The order of reactivity of halogen acids for reaction with C₂H₅OH is

• HCl > HBr > HI A
• HI > HBr > HCl B
• HBr > HI > HCl C
• HBr > HCl > HI D