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JEE Main

Explore popular questions from Alcohols, Phenols and Ethers for JEE Main. This collection covers Alcohols, Phenols and Ethers previous year JEE Main questions hand picked by experienced teachers.

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Alcohols, Phenols and Ethers

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Q 1. The final product obtained in the reaction

B

C

D

Explanation

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Q 2. Which of the following compounds does not give alcohol on reaction with RMgX?

A

B

D

Explanation

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Q 3.
Product (B) is:

A

C

D

Explanation

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Q 4. Dehydration of alcohol to alkene by heating with conc. {tex}\mathrm{H_2SO_4}{/tex} the initiation step is _______ followed with ______ mechanism.

A

Elimination of water, free radical

B

Formation of an ester, free radical

Protonation of alcohol, carbocation

D

Protonation of alcohol, carbanion

Explanation

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Q 5. Ethylene glycol on treatment with {tex} \mathrm { PI } _ { 3 } {/tex} mainly gives:

Ethylene

B

Ethylene iodide

C

Ethyl iodide

D

Ethane

Explanation

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Q 6.

Select the correct code for given reaction

A

I and III

B

II and IV

C

I and IV

II and III

Explanation

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Q 7. Consider the following sequence of reaction

Product D is:

A

{tex} \mathrm { PhCH } _ { 2 } \mathrm { OPh } {/tex}

{tex} \mathrm { PhCH } _ { 2 } \mathrm { OCH } _ { 2 } \mathrm { Ph } {/tex}

C

{tex} \mathrm { PhCH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { Ph } {/tex}

D

Explanation

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Q 8. When sodium benzenesulphonate is fused with solid sodium hydroxide and subsequently acidified with dilute sulphuric acid, the product formed is:

A

benzene

B

sodium phenoxide

C

thiophenol

phenol

Explanation

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Q 9. Consider the reaction:

A

B

C

Explanation

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Q 10.
A and B are:

B

C

D

Explanation

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Q 11.
The products (A) and (B) are:

A

B

D

Explanation

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Q 12. Which of the following can give purple colour with neutral {tex} \mathrm { FeCl } _ { 3 } {/tex}?

II and IV

B

I and III

C

II and III

D

III and IV

Explanation

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Q 13. Phenol cannot be converted into salicylic acid by heating with:

A

{tex} \mathrm { CO } _ { 2 } {/tex} (under pressure) and alkali

B

{tex} \mathrm { CCl } _ { 4 } {/tex} and alkali

{tex} \mathrm { CHCl } _ { 3 } {/tex} and alkali

D

{tex} \mathrm { HCN } / \mathrm { HCl } , {/tex} followed by oxidation

Explanation

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Q 14.
Identify the structure of 'P'

B

C

D

Explanation

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Q 15. The enzymes {tex} A , B {/tex} and {tex} C {/tex} in the reaction sequence are: {tex} \left( C _ { 6 } H _ { 10 } O _ { 5 } \right) _ { n } \stackrel { A } { \longrightarrow } C _ { 12 } H _ { 22 } O _ { 11 } \stackrel { B } { \longrightarrow } C _ { 6 } H _ { 12 } O _ { 6 } \stackrel { C } { \longrightarrow } C _ { 2 } H _ { 5 } O H {/tex}

A

Invertase, Maltase, Zymase

Diastase, Maltase, Zymase

C

Maltase, Zymase, Invertase

D

Diastase, Zymase, Maltase

Explanation

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Q 16. Which sequence of steps describes the best synthesis of 2-methyl-{tex}3 {/tex}-pentanone?

A

B

D

Explanation

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Q 17.
Molecular formula of A increases by {tex} \mathrm { C } _ { 8 } \mathrm { H } _ { 8 } \mathrm { O } _ { 4 } {/tex} Number of OH group present in {tex} \mathrm { A } {/tex} are:

A

3

4

C

5

D

Explanation

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Q 18.
Which one in not correct

A

C

D

Explanation

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Q 19. In order to obtain diethyl ether from ethanol and sulphuric acid, the latter is taken:

A

In equal amount of sulphuric acid

B

In slightly lesser amount of sulphuric acid

In excess amount of sulphuric acid

D

In far lesser amount of sulphuric acid

Explanation

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Q 20. Which of the following reagents would carry out of the following transformation {tex} ? \left( \mathrm { D } = ^ { 2 } \mathrm { H } \right) {/tex}

{tex} \mathrm { NaBD } _ { 4 } {/tex} in {tex} \mathrm { CH } _ { 3 } \mathrm { OH } {/tex}

B

LiAlH {tex} _ { 4 } , {/tex} then {tex} \mathrm { D } _ { 2 } \mathrm { O } {/tex}

C

{tex} \left( \mathrm { NaBD } _ { 4 } \text { in } \mathrm { CH } _ { 3 } \mathrm { OD } \right. {/tex}

D

LiAlD_ {tex} _ { 4 } , {/tex} then {tex} \mathrm { D } _ { 2 } \mathrm { O } {/tex}

Explanation

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Q 21. Which of the following is the final product in the reaction between benzoyl chloride and phenyl magnesium bromide?

A

B

C

{tex} \mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { COOH } {/tex}

{tex} \left( \mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \right) _ { 3 } \mathrm { COH } {/tex}

Explanation



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Q 22. Which 'A' gives blue color in the reaction?

A

{tex} \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { NO } _ { 2 } {/tex}

{tex} \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHNO } _ { 2 } {/tex}

C

{tex} \left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CNO } _ { 2 } {/tex}

D

Explanation



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Q 23. Methyl propionate, {tex}\mathrm{CH_3CH_2COOCH_3}{/tex}, is heated with aqueous {tex}\mathrm{H_2SO_4}{/tex} in {tex}\mathrm{^{18}O}{/tex} labelled water. When the equilibrium is achieved, the labelled oxygen will be present in:

A

methyl alcohol

Propionic acid

C

unchanged methyl propionate

D

both propionic acid and methyl propionate

Explanation

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Q 24. A compound 'X' with molecular formula {tex}\mathrm{C_3H_8O}{/tex} can be oxidised to a compound 'Y' with the molecular formula {tex}\mathrm{C_3H_6O}{/tex},'X' is most likely to be:

Primary alcohol

B

Secondary alcohol

C

Aldehyde

D

Ketone

Explanation

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Q 25. Ortho-nitrophenol is steam volatile, whereas para-nitrophenol is not. This is due to

the presence of intramolecular hydrogen boding in o-nitrophenol.

B

the presence of intermolecular hydrogen bonding in o-nitrophenol.

C

the presence of intermolecular hydrogen bonding in p-nitrophenol.

D

None of these.

Explanation