ECAT Pre Engineering Chemistry Chapter 22 MCQ Test With Answer

Grignard reagent on reaction with a ketone forms

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

Alcohols are named by replacing 'e' of alkane with:

• al A
• ene B
• ol C
• one D

Which of the following is known as wood spirit

• Ethyl alcohol A
• Propyl alcohol B
• Methyl alcohol C
• Butyl alcohol D

Phenol is also known as

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

During dehydration of alcohols to alkenes by heating with conc. H₂SO₄, the initial step is

• Formation of an ester A
• Protonation of alcohol molecule B
• Formation of carbocation C
• Elimination of water D

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

• 
  A
• 
  B
• 
  C
• 
  D

• A primary alcohol A
• A secondary alcohol B
• An eher C
• A phenol D

Methanol is prepared from CO and H_{2 using catalyst:}

• ZnO A
• Cr₂O₃ B
• Pt C
• Ni D

Phenol is more readily soluble in

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

An alcohol with molecular formula C_nH_2n+1OH has a chiral carbon atom but does not react with MnO^-₄/H⁺what is the least number of carbon atoms such an alcohol could possess

• 5 A
• 6 B
• 7 C
• 8 D

C₂H₅OH can be differentiated from CH₃OH by

• Reaction with HCl A
• Reaction with NH₃ B
• Iodoform test C
• Solubility in water D

Rectified spirit contains alcohol about

• 80% A
• 85% B
• 90% C
• 95% D

Which the increase in carbon number of solubility of an alcohol

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

Alcohols of low molecular weight are

• Soluble in water A
• Soluble in water on heating B
• Insoluble in water C
• Insoluble in all solvents D

Alcohols reacts with Grignard reagent to form

• Alkanes A
• Alkenes B
• Alkynes C
• All D

Na reacts with phenol to produce

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

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

Ethyl alcohol may be identified by

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

When ethylene glycol is heated with acidified potassium permanganate, the main organic compound obtained is

• Oxalic acid A
• Glyoxal B
• Formic acid C
• Ethanol D

Absolute alcohol is obtained by adding rectified apirit in alcohol:

• Water A
• Na₂CO₃ B
• NaOH C
• CaO D

Alcohol can be denaturated by adding:

• Acetone A
• Methanol B
• Pyridine C
• All D

Which of the following is weakly acidic in nature

• Alcohol A
• Phenol B
• Aidehyde C
• Amide 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

When alcohol reacts with concentreated H₂SO₄intermediate compound formed as

• carbonium ion A
• alkoxy ion B
• alkyl hydrogen sulphate C
• non of these D

Alcohol fermentation is brought about by the action of

• CO₂ A
• O₂ B
• Invertase C
• Yeast D

Alcohols, phenols and ethers may be considered as derivative of

• Hydrocarbons A
• Benzene B
• Carboxylic acid C
• Water D

Which of the following is the most suitable method for removing the traces of water from ethanol?

• Reacting with Na metal A
• Passing dry HCl through it B
• Distilling it C
• Reacting with Mg 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

The only alcohol that can be prepared by the indirect hydration of alkene is

• ethyl alcohol A
• propyl alcohol B
• isobutyl alcohol C
• methyl alcohol D