Alcohols, Phenols and Ethers Chapter-Wise Test 7

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which compound is produced when ethyl magnesium chloride reacts with formaldehyde followed by hydrolysis?

Ethyl magnesium chloride (\( \ce{CH3CH2MgCl} \)) reacts with formaldehyde (\( \ce{HCHO} \)), adding the ethyl group to the carbonyl carbon, and hydrolysis yields propan-1-ol (\( \ce{CH3CH2CH2OH} \)).

Ethanol
Propan-2-ol
Butan-1-ol
Propan-1-ol
4

Which compound is formed when phenol reacts with dilute \( \ce{HNO3} \)?

Phenol reacts with dilute \( \ce{HNO3} \) to form a mixture of 2-nitrophenol and 4-nitrophenol, with 2-nitrophenol being a significant product due to ortho-para directing effect of -OH.

4-Nitrophenol only
2-Nitrophenol
2,4,6-Trinitrophenol
3-Nitrophenol
2

Which alcohol yields pent-2-ene as the major product on dehydration with conc. \( \ce{H2SO4} \) at 160°C?

Pentan-2-ol (\( \ce{CH3CH(OH)CH2CH2CH3} \)) dehydrates to pent-2-ene (\( \ce{CH3CH=CHCH2CH3} \)) as the major product, following Saytzeff’s rule.

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

The dehydration of ethanol to ethene proceeds via which type of mechanism?

Ethanol, a primary alcohol, undergoes acid-catalyzed dehydration via a concerted E2 mechanism because formation of a primary carbocation is unstable.

E1 mechanism
E2 mechanism
Free radical mechanism
Nucleophilic substitution
2

Which compound is formed when phenol reacts with \( \ce{Na} \)?

Phenol (\( \ce{C6H5OH} \)) reacts with sodium metal to form sodium phenoxide (\( \ce{C6H5ONa} \)) and hydrogen gas, showcasing its acidic nature.

Benzene
Phenol sodium
Sodium benzoate
Sodium phenoxide
4

Which compound results when 2-methylbutan-2-ol is dehydrated with conc. \( \ce{H2SO4} \)?

2-Methylbutan-2-ol (\( \ce{CH3C(OH)(CH3)CH2CH3} \)) dehydrates to 2-methylbut-2-ene (\( \ce{CH3C(CH3)=CHCH3} \)) as the major product, following Saytzeff’s rule.

2-Methylbut-1-ene
Pent-2-ene
2-Methylbutane
2-Methylbut-2-ene
4

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

The compound has a 5-carbon chain with -OH groups on carbons 2 and 4, named pentane-2,4-diol in IUPAC nomenclature.

Pentane-1,2-diol
Pentane-2,3-diol
Pentane-1,4-diol
Pentane-2,4-diol
4

Which compound is produced when phenol is heated with zinc dust?

Phenol (\( \ce{C6H5OH} \)) is reduced to benzene (\( \ce{C6H6} \)) when heated with zinc dust, removing the -OH group as \( \ce{ZnO} \) and \( \ce{H2} \).

Cyclohexane
Toluene
Phenol remains unchanged
Benzene
4

Which of the following alcohols reacts fastest with Lucas reagent?

Lucas reagent (\( \ce{ZnCl2} \) in conc. \( \ce{HCl} \)) reacts fastest with tertiary alcohols like \( \ce{(CH3)3COH} \) due to the stability of the tertiary carbocation, causing immediate turbidity.

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

What gas is evolved when phenol reacts with sodium metal?

Phenol (\( \ce{C6H5OH} \)) reacts with \( \ce{Na} \) to form sodium phenoxide and releases hydrogen gas (\( \ce{H2} \)), indicating its acidic nature.

\( \ce{H2} \)
\( \ce{O2} \)
\( \ce{CO2} \)
\( \ce{Cl2} \)
1

Performance Summary

Score:

Category Details
Total Attempts:
Total Skipped:
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
Accuracy:
0