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  4. Alcohols, Phenols and Ethers Chapter-Wise Test 2

Alcohols, Phenols and Ethers Chapter-Wise Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which condition favors mononitration of phenol when it reacts with \( \ce{HNO3} \)?

Dilute \( \ce{HNO3} \) at low temperature favors mononitration of phenol, producing a mixture of 2-nitrophenol and 4-nitrophenol, with the para isomer being the major product due to lower steric hindrance.

Conc. \( \ce{HNO3} \) at 60°C
Dilute \( \ce{HNO3} \) at 20°C
Conc. \( \ce{HNO3} \) at 100°C
Dilute \( \ce{HNO3} \) with \( \ce{H2SO4} \)
2

Which alcohol forms a yellow precipitate with \( \ce{I2} \) and \( \ce{NaOH} \) only after oxidation?

Ethanol (\( \ce{CH3CH2OH} \)) oxidizes to acetaldehyde, which has a \( \ce{CH3CO-} \) group and gives a yellow iodoform precipitate with \( \ce{I2} \) and \( \ce{NaOH} \).

\( \ce{CH3CH2OH} \)
\( \ce{CH3CH2CH2OH} \)
\( \ce{(CH3)2CHCH2OH} \)
\( \ce{(CH3)3COH} \)
1

What is the IUPAC name of \( \ce{HO-CH2-CH2-OH} \)?

The compound has a 2-carbon chain with -OH groups on both carbons. The base name is ethane, and with two -OH groups, it is ethane-1,2-diol.

Ethanol
Propan-1,2-diol
Ethane-1,2-diol
Ethane-1,1-diol
3

Which of the following alcohols does not give a positive iodoform test?

The iodoform test is positive for \( \ce{CH3CH(OH)-} \) structures. Propan-1-ol (\( \ce{CH3CH2CH2OH} \)) oxidizes to propanal, which lacks the required group, giving a negative result.

\( \ce{CH3CH(OH)CH3} \)
\( \ce{CH3CH2OH} \)
\( \ce{CH3CH2CH2OH} \)
\( \ce{CH3CH(OH)CH2CH3} \)
3

Which alcohol, on oxidation with PCC, yields a compound that does not react with \( \ce{I2} \) and \( \ce{NaOH} \)?

Propan-1-ol (\( \ce{CH3CH2CH2OH} \)) oxidizes to propanal (\( \ce{CH3CH2CHO} \)) with PCC, which lacks the \( \ce{CH3CO-} \) group and does not give an iodoform reaction.

\( \ce{CH3CH(OH)CH3} \)
\( \ce{CH3CH2CH2OH} \)
\( \ce{CH3CH(OH)CH2CH3} \)
\( \ce{CH3CH2OH} \)
2

Which type of alcohol is commonly used in the manufacture of detergents?

Long-chain (fatty) alcohols such as lauryl alcohol are commonly used in the manufacture of detergents due to their ability to form surfactants.

Methanol
Propan-2-ol
Long-chain alcohols (fatty alcohols)
Ethanol
3

Which compound reacts with \( \ce{CH3MgBr} \) followed by hydrolysis to form a tertiary alcohol?

Propan-2-one (\( \ce{CH3COCH3} \)) reacts with \( \ce{CH3MgBr} \), adding a methyl group to the carbonyl carbon, yielding 2-methylpropan-2-ol (\( \ce{(CH3)3COH} \)) after hydrolysis, which is a tertiary alcohol.

\( \ce{CH3COCH3} \)
\( \ce{CH3CH2CHO} \)
\( \ce{CH3CH2CH2OH} \)
\( \ce{CH3CH2OH} \)
1

Which alcohol is used as a disinfectant in medical applications?

Propan-2-ol (\( \ce{CH3CH(OH)CH3} \)), commonly known as isopropyl alcohol, is widely used as a disinfectant due to its antiseptic properties.

Ethanol
Methanol
Glycerol
Propan-2-ol
4

What is the product when phenol reacts with conc. \( \ce{H2SO4} \) at 25°C?

Phenol reacts with conc. \( \ce{H2SO4} \) at 25°C to form phenol-2-sulfonic acid (2-hydroxybenzenesulfonic acid) as the major product due to ortho substitution.

Phenol-4-sulfonic acid
2,4-Disulfonic phenol
Benzene
Phenol-2-sulfonic acid
4

Which reagent converts ethanol to acetaldehyde?

Ethanol (\( \ce{CH3CH2OH} \)), a primary alcohol, is oxidized to acetaldehyde (\( \ce{CH3CHO} \)) with PCC, which selectively oxidizes to the aldehyde stage.

PCC
\( \ce{KMnO4} \)
\( \ce{NaBH4} \)
Conc. \( \ce{H2SO4} \)
1

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