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  4. Alcohols, Phenols and Ethers Chapter-Wise Test 3

Alcohols, Phenols and Ethers Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Why does glycerol have a higher boiling point than ethanol?

Glycerol (\( \ce{CH2OH-CHOH-CH2OH} \)) has three -OH groups, forming extensive hydrogen bonding, which increases its boiling point compared to ethanol with one -OH group.

Higher molecular weight only
Extensive hydrogen bonding
Presence of carbon atoms
Lower volatility
2

Which alcohol is a trihydric alcohol?

A trihydric alcohol has three -OH groups. Glycerol (\( \ce{CH2OH-CHOH-CH2OH} \)) is a trihydric alcohol, also known as propane-1,2,3-triol.

Ethanol
Ethane-1,2-diol
Propane-1,2,3-triol
Propan-2-ol
3

Which alcohol is a common ingredient in antifreeze and hydraulic fluids?

Ethane-1,2-diol (\( \ce{CH2OH-CH2OH} \)), or ethylene glycol, is widely used in antifreeze and hydraulic fluids due to its low freezing point and high boiling point.

Methanol
Ethanol
Propan-2-ol
Ethane-1,2-diol
4

Why does 2-nitrophenol have a lower boiling point than 4-nitrophenol?

2-Nitrophenol has intramolecular hydrogen bonding, reducing intermolecular forces and lowering its boiling point, while 4-nitrophenol has intermolecular hydrogen bonding, increasing its boiling point.

Higher molecular weight
Intramolecular hydrogen bonding
Resonance effect
Steric hindrance
2

What is the IUPAC name of \( \ce{CH2OH-CH2-CH2-OH} \)?

The compound has a 3-carbon chain with -OH groups on carbons 1 and 3, named propane-1,3-diol in IUPAC nomenclature.

Propane-1,2-diol
Propane-1,3-diol
Ethane-1,2-diol
Propane-2,3-diol
2

What is the total number of carbon atoms in \( \ce{CH3-CH(OH)-CH2-CH(OH)-CH3} \)?

Pentane-2,4-diol (\( \ce{CH3-CH(OH)-CH2-CH(OH)-CH3} \)) has a 5-carbon chain, as counted from one end to the other: \( \ce{CH3-CH-CH2-CH-CH3} \).

4
5
3
6
2

Why is 4-nitrophenol less volatile than 2-nitrophenol?

4-Nitrophenol has intermolecular hydrogen bonding, increasing intermolecular forces and reducing volatility, while 2-nitrophenol has intramolecular hydrogen bonding, making it more volatile.

Higher molecular weight
Resonance effect
Intermolecular hydrogen bonding
Steric hindrance
3

Which alcohol gives a positive iodoform test?

The iodoform test is positive for alcohols with a \( \ce{CH3CH(OH)-} \) group. Propan-2-ol (\( \ce{CH3CH(OH)CH3} \)) oxidizes to acetone, which gives a positive result.

\( \ce{CH3CH2OH} \)
\( \ce{CH3CH(OH)CH3} \)
\( \ce{CH3CH2CH2OH} \)
\( \ce{CH2=CH-OH} \)
2

What is the IUPAC name of \( \ce{CH3-CH(OH)-CH2-OH} \)?

The compound has a 3-carbon chain with -OH groups on carbons 1 and 2, named propane-1,2-diol in IUPAC nomenclature.

Propane-1,3-diol
Propane-1,2-diol
Ethane-1,2-diol
Propane-2,3-diol
2

Which compound is formed when butan-2-ol is oxidized with PCC?

Butan-2-ol (\( \ce{CH3CH(OH)CH2CH3} \)), a secondary alcohol, is oxidized to butan-2-one (\( \ce{CH3COCH2CH3} \)) with PCC.

Butanal
Butan-2-one
Butanoic acid
Propanal
2

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