Alcohols, Phenols and Ethers Chapter-Wise Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which alcohol, when treated with Lucas reagent, shows turbidity within 5–10 minutes?

Propan-2-ol (\( \ce{CH3CH(OH)CH3} \)), a secondary alcohol, forms a secondary carbocation with Lucas reagent (\( \ce{ZnCl2} \) in conc. \( \ce{HCl} \)), causing turbidity in 5–10 minutes.

\( \ce{CH3CH2CH2OH} \)
\( \ce{(CH3)3COH} \)
\( \ce{CH3CH(OH)CH3} \)
\( \ce{CH3CH2OH} \)
3

What is the maximum number of carbon atoms in the longest chain of \( \ce{CH3-C(OH)(CH3)-CH2-CH3} \)?

The longest chain in \( \ce{CH3-C(OH)(CH3)-CH2-CH3} \) (2-methylbutan-2-ol) includes four carbons: \( \ce{CH3-CH2-C(OH)-CH3} \), with -OH and a methyl branch on the second carbon.

3
5
4
6
3

What is the product of the Reimer-Tiemann reaction with phenol?

Phenol reacts with \( \ce{CHCl3} \) and aqueous \( \ce{NaOH} \) in the Reimer-Tiemann reaction to form salicylaldehyde (2-hydroxybenzaldehyde) via electrophilic substitution at the ortho position.

Benzaldehyde
4-Hydroxybenzaldehyde
Phenyl acetate
Salicylaldehyde
4

Which alcohol is produced when ethyl magnesium bromide reacts with ethanal followed by hydrolysis?

Ethyl magnesium bromide (\( \ce{CH3CH2MgBr} \)) reacts with ethanal (\( \ce{CH3CHO} \)), adding the ethyl group to the carbonyl, yielding butan-2-ol (\( \ce{CH3CH(OH)CH2CH3} \)) after hydrolysis.

Propan-1-ol
Butan-1-ol
Butan-2-ol
2-Methylpropan-2-ol
3

Which alcohol is produced when methyl magnesium bromide reacts with butanal followed by hydrolysis?

Methyl magnesium bromide (\( \ce{CH3MgBr} \)) reacts with butanal (\( \ce{CH3CH2CH2CHO} \)), adding the methyl group to the carbonyl, yielding pentan-2-ol (\( \ce{CH3CH(OH)CH2CH2CH3} \)) after hydrolysis.

Pentan-1-ol
Butan-2-ol
Pentan-2-ol
2-Methylbutan-1-ol
3

Which alcohol is most commonly used as a solvent in pharmaceutical preparations?

Methanol
Glycerol
Propan-2-ol
Ethanol
4

Ethanol is the most commonly used solvent in pharmaceutical preparations due to its effectiveness and relatively low toxicity.

Which alcohol is produced when ethyl magnesium bromide reacts with propanal followed by hydrolysis?

Ethyl magnesium bromide (\( \ce{CH3CH2MgBr} \)) reacts with propanal (\( \ce{CH3CH2CHO} \)), adding the ethyl group to the carbonyl, yielding pentan-3-ol (\( \ce{CH3CH2CH(OH)CH2CH3} \)) after hydrolysis.

Pentan-1-ol
Pentan-2-ol
Pentan-3-ol
2-Methylbutan-2-ol
3

What is the product when phenol reacts with \( \ce{Br2} \) in water?

Phenol reacts with \( \ce{Br2} \) in water to form 2,4,6-tribromophenol due to the strong activation of the ring by the -OH group, leading to trisubstitution.

2-Bromophenol
4-Bromophenol
2,4-Dibromophenol
2,4,6-Tribromophenol
4

Which compound is formed when 2-methylpropan-2-ol is dehydrated?

2-Methylpropan-2-ol (\( \ce{(CH3)3COH} \)) dehydrates with conc. \( \ce{H2SO4} \) to form 2-methylpropene (\( \ce{CH2=C(CH3)CH3} \)), following Saytzeff’s rule.

Propene
2-Methylpropene
But-1-ene
But-2-ene
2

Which reagent confirms the presence of a phenolic -OH group in a compound?

Neutral \( \ce{FeCl3} \) forms a violet complex with phenols due to coordination with the phenoxide ion, distinguishing them from alcohols.

\( \ce{I2} \) with \( \ce{NaOH} \)
Lucas reagent
Neutral \( \ce{FeCl3} \)
\( \ce{KMnO4} \)
3

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