Alcohols, Phenols and Ethers Chapter-Wise Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which phenol derivative is used as an explosive?

2,4,6-Trinitrophenol (picric acid), formed by nitrating phenol with conc. \( \ce{HNO3} \), is used as an explosive due to its high reactivity.

2-Nitrophenol
2,4,6-Trinitrophenol
4-Nitrophenol
2,4-Dinitrophenol
2

Which compound is produced when phenol reacts with conc. \( \ce{HNO3} \) at 60°C?

Phenol reacts with conc. \( \ce{HNO3} \) at 60°C to form 2,4,6-trinitrophenol (picric acid) due to the strong activation of the ring by the -OH group, allowing trisubstitution.

2-Nitrophenol
4-Nitrophenol
2,4-Dinitrophenol
2,4,6-Trinitrophenol
4

What is the product when propan-1-ol is oxidized with alkaline \( \ce{KMnO4} \)?

Propan-1-ol (\( \ce{CH3-CH2-CH2OH} \)), a primary alcohol, is oxidized to propanoic acid (\( \ce{CH3-CH2-COOH} \)) with a strong oxidizing agent like alkaline \( \ce{KMnO4} \).

Propanal
Propanoic acid
Propan-2-ol
Ethanoic acid
2

Which alcohol produces propanal on oxidation with PCC?

Propan-1-ol (\( \ce{CH3CH2CH2OH} \)), a primary alcohol, oxidizes to propanal (\( \ce{CH3CH2CHO} \)) with PCC.

\( \ce{CH3CH(OH)CH3} \)
\( \ce{CH3CH2CH2OH} \)
\( \ce{(CH3)3COH} \)
\( \ce{CH3CH2OH} \)
2

Phenol reacts with chloroform in the presence of aqueous \( \ce{NaOH} \) to produce which compound?

This is the Reimer-Tiemann reaction, where phenol reacts with \( \ce{CHCl3} \) and \( \ce{NaOH} \) to form salicylaldehyde (2-hydroxybenzaldehyde) via ortho substitution.

Salicylaldehyde
Benzaldehyde
4-Hydroxybenzaldehyde
2-Nitrophenol
1

What is the product when 2-methylbutan-2-ol reacts with Lucas reagent?

2-Methylbutan-2-ol (\( \ce{CH3C(OH)(CH3)CH2CH3} \)), a tertiary alcohol, reacts with Lucas reagent (\( \ce{ZnCl2} \) in conc. \( \ce{HCl} \)) to form 2-chloro-2-methylbutane (\( \ce{CH3C(Cl)(CH3)CH2CH3} \)) via an \( \ce{S_N1} \) mechanism.

2-Methylbut-2-ene
Pentan-2-ol
2-Chloro-2-methylbutane
2-Methylbutanal
3

Which factor explains the lower boiling point of methanol compared to ethanol?

Methanol (\( \ce{CH3OH} \)) has a lower molecular weight (32 g/mol) than ethanol (\( \ce{CH3CH2OH} \), 46 g/mol), reducing van der Waals forces and thus lowering its boiling point.

Stronger hydrogen bonding
Shorter carbon chain
Lower molecular weight
Higher polarity
3

Which alcohol is produced by the acid-catalyzed hydration of 2-methylpropene?

2-Methylpropene (\( \ce{CH2=C(CH3)CH3} \)) undergoes acid-catalyzed hydration with \( \ce{H2SO4} \) and \( \ce{H2O} \), following Markovnikov’s rule, to form 2-methylpropan-2-ol (\( \ce{(CH3)3COH} \)).

\( \ce{(CH3)3COH} \)
\( \ce{CH3CH2CH2OH} \)
\( \ce{CH3CH(OH)CH3} \)
\( \ce{(CH3)2CHCH2OH} \)
1

Which compound is formed when ethanol reacts with \( \ce{I2} \) and \( \ce{NaOH} \)?

Ethanol (\( \ce{CH3CH2OH} \)) oxidizes to acetaldehyde, which reacts with \( \ce{I2} \) and \( \ce{NaOH} \) in the iodoform test to form iodoform (\( \ce{CHI3} \)), a yellow precipitate.

Chloroform
Ethanal
Ethyl iodide
Iodoform
4

Which reagent oxidizes benzyl alcohol to benzoic acid?

Benzyl alcohol (\( \ce{C6H5CH2OH} \)) is oxidized to benzoic acid (\( \ce{C6H5COOH} \)) using a strong oxidizing agent like \( \ce{KMnO4} \) in alkaline conditions.

PCC
\( \ce{NaBH4} \)
\( \ce{KMnO4} \)
\( \ce{Br2} \)
3

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