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JEE • CHEMISTRY • ALCOHOLS & PHENOLS & ETHERS

Alcohols & phenols & ethers practice · Hard

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Hard

1 of 16

Analyzing +4 | -1

Assertion:-

\mathrm{m}

- Nitrophenol is less acidic than

\mathrm{p}

- nitrophenol.
Reason:-p-Nitrophenol has intermolecular

\mathrm{H}

-bonding.

View answer and explanation

Correct option: B

If both Assertion & reason are True but Reason is not a correct explanation of the Assertion

Option B (If both Assertion & reason are True but Reason is not a correct explanation of the Assertion) is correct because both the assertion and reason are true, but the reason doesn't explain the assertion.

2 Hard

2 of 16

Analyzing +4 | -1

Assertion: Addition of water to but-1-ene in acidic medium yields butan-1-ol.

Reason: Addition the formation of primary carbocation.

View answer and explanation

Correct option: D

If both Assertion and Reason are false

Option D (If both Assertion and Reason are false) is correct because the addition of water to but-1-ene in acidic medium yields butan-2-ol, not butan-1-ol, and the reaction proceeds via a secondary carbocation.

3 Hard

3 of 16

Analyzing +4 | -1

Which of the following ethers is the most unreactive to cleavage with

H B r

View answer and explanation

Correct option: C

\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OC}_{6} \mathrm{H}_{5}

Option C (

\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OC}_{6} \mathrm{H}_{5}

) is the most unreactive because the oxygen's lone pairs are delocalized into both phenyl rings, stabilizing the ether and making it less susceptible to cleavage.

4 Hard

4 of 16

Remembering +4 | -1

Nobel’s oil is:

View answer and explanation

Correct option: C

Explosive

Option C (Explosive) is correct because Nobel's oil is another name for nitroglycerin, a powerful explosive.

5 Hard

5 of 16

Analyzing +4 | -1

Consider the following compounds.

(A) Phenol

(B) Propyne

(C) Benzene sulphonic acid

(D) Benzoic acid

(E) Cyclopentadiene

(F) Ethane

(G) Picric acid

(H) 4-Nitro Cyclohexanol

If

(\mathrm{X})

is the total number of compounds which evolve

\mathrm{H}_2

gas with

\mathrm{Na}

metal and

(\mathrm{Y})

is the total number of compounds which evolve

\mathrm{CO}_2

gas with

\mathrm{NaHCO}_3

. Then find the value of

(\mathrm{X}-\mathrm{Y})

View answer and explanation

Correct option: A

Option A (4) is correct because there are 7 compounds that evolve H2 gas with Na metal (A, B, C, D, E, G, H) and 3 compounds that evolve CO2 gas with NaHCO3 (C, D, G), so X-Y = 7-3 = 4.

6 Hard

6 of 16

Application +4 | -1

An ether contains

60 \%

carbon and

13.3 \%

hydrogen. Formula of the ether is

View answer and explanation

Correct option: B

{C_3}{H_8}O

Option B (

{C_3}{H_8}O

) is correct because the empirical formula derived from the given percentages of carbon, hydrogen, and oxygen matches this ether's composition.

7 Hard

7 of 16

Application +4 | -1

{CH}_3-{CH}_2-{CH}={CH}_2 \stackrel{x}{\longrightarrow} {CH}_3 {CH}_2-{CH}_2-{CH}_2 {OH}

What is the suitable reagent

x?

View answer and explanation

Correct option: B

{B}_2 {H}_6\left|{THF}, {H}_2{O}_2\right| {OH}^{-}

Option B (

{B}_2 {H}_6\left|{THF}, {H}_2{O}_2\right| {OH}^{-}

) is correct because it represents the hydroboration-oxidation reaction, which converts alkenes to alcohols with anti-Markovnikov addition.

8 Hard

8 of 16

Application +4 | -1

To prepare 3-ethylpentane-3-ol, the reactants needed are:

View answer and explanation

Correct option: C

\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{MgBr}+\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COCH}_2 \mathrm{CH}_3

The correct answer is C (

\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{MgBr}+\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COCH}_2 \mathrm{CH}_3

) because the Grignard reagent reacts with the ketone to form the desired tertiary alcohol after hydrolysis.

9 Hard

9 of 16

Remembering +4 | -1

Which of the following are known as mercaptans?

View answer and explanation

Correct option: A

Thio-alcohols

Option A (Thio-alcohols) is correct because mercaptans are also known as thio-alcohols and have the general formula R-SH.

10 Hard

10 of 16

Analyzing +4 | -1

Assertion: Tertiary alcohols gets converted into an alkene instead of a carbonyl Compounds in the presence of heated metallic copper.

Reason: Tertiary alcohols prefer to undergo dehydrogenation instead of dehydration in the presence of heated copper.

View answer and explanation

Correct option: C

Assertion is correct, but reason is wrong statement.

The correct answer is C (Assertion is correct, but reason is wrong statement) because tertiary alcohols undergo dehydration to form alkenes in the presence of heated copper, not dehydrogenation.

11 Hard

11 of 16

Understanding +4 | -1

C{H_3}C{H_2}C{H_2}OH

is a functional isomer of

View answer and explanation

Correct option: A

{C_2}{H_5}OC{H_3}

Option A (

{C_2}{H_5}OC{H_3}

) is correct because it is an ether with the same molecular formula as the given alcohol, making them functional isomers.

12 Hard

12 of 16

Understanding +4 | -1

Name the reagent used to convert bromoethane to ethoxy ethane

View answer and explanation

Correct option: A

Sodium ethoxide

Option A (Sodium ethoxide) is correct because bromoethane reacts with sodium ethoxide via Williamson ether synthesis to form ethoxyethane.

13 Hard

13 of 16

Understanding +4 | -1

Assertion:- Benzamide and methyl benzoate are derivatives of benzoic acid.

Reason:- Benzamide is less easily hydrolysed as compared to methyl benzoate.

View answer and explanation

Correct option: D

If both Assertion & reason are False

The correct answer is C (If Assertion is True but the Reason is False) because benzamide is indeed a derivative of benzoic acid, but it is *more* resistant to hydrolysis than methyl benzoate due to resonance stabilization.

14 Hard

14 of 16

Understanding +4 | -1

Statement 1:

3^\circ

Butylalcohol has more lewis basic nature than methylalcohol.

Statement 2:

+I

nature of

3^\circ

butyl group increase the basic nature.

View answer and explanation

Correct option: A

Both the statements are true

Option A (Both the statements are true) is correct because the +I effect of the 3° butyl group increases the electron density on the oxygen atom, making it more basic than methanol.

15 Hard

15 of 16

Analyzing +4 | -1

Assertion:- Dehydration of alcohols always take place in basic medium.

Reason:-

\mathrm{OH}

- is a good leaving group

View answer and explanation

Correct option: D

If both Assertion & reason are False

Option D is correct. Dehydration of alcohols requires an acidic medium, and OH- is a poor leaving group.

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16 Hard

16 of 16

Analyzing +4 | -1

Assertion: ter-butyl methyl ether is not prepared by the reaction of ter-butyl bromide with sodium methoxide.

Reason: Sodium methoxide is a strong nucleophile.

View answer and explanation

Correct option: B

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

Option B is correct because both the assertion and reason are correct, but the reason (sodium methoxide being a strong nucleophile) doesn't explain why tert-butyl methyl ether isn't formed; elimination is favored due to steric hindrance.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 16 single-correct-answer MCQs on ALCOHOLS & PHENOLS & ETHERS.
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