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BoardChemistry

Alcohols, Phenols and Ethers

9 Board Chemistry previous year questions on Alcohols, Phenols and Ethers — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.

Q1 FREE PREVIEW
PYQ

Given below are two statements

Statement-I: The boiling points of alcohols and phenols increase with increase in number of carbon atoms

Statement-II: The boiling points of alcohols and phenols are higher in comparison to other class of compounds such as ethers, haloalkanes

In the light of above statements, choose the correct answer from options given below

[JEE Main 2025, 23 Jan (Shift 2)]

a

Statement-I is true but statement-II is false

b

Both statement-I and statement-II are true

c

Statement-I is false but statement-II is true

d

Both statement-I and statement-II are false

✓ Correct answer: b)

Both statement-I and statement-II are true

Explanation

Statement-I is true because as the number of carbon atoms increases, molecular weight and van der Waals forces increase, leading to higher boiling points in alcohols and phenols.

Statement-II is also true since alcohols and phenols form strong hydrogen bonds, making their boiling points higher than ethers and haloalkanes, which only have weaker dipole-dipole or van der Waals interactions. Hence, both statements are correct.

Q2
PYQ

Given below are two statements :
Statement (I) : p-nitrophenol is more acidic than m-nitrophenol and o-nitrophenol.
Statement (II) : Ethanol will give immediate turbidity with Lucas reagent.
In the light of the above statements, choose the correct answer from the options given below :

[JEE Main 2024, 27 Jan (Shift 1)]

a

Statement I is false but Statement II is true

b

Both Statement I and Statement II are false

c

Both Statement I and Statement II are true

d

Statement I is true but Statement II is false

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Q3
PYQ

Given below are two statements: One is labelled as Assertion \(A\) and the other is labelled as Reason R:
Assertion A: Alcohols react both as nucleophiles and electrophiles.
Reason R: Alcohols react with active metals such as sodium, potassium and aluminum to yield corresponding alkoxides and liberate hydrogen.
In the light of the above statements, choose the correct answer from the options given below:

a

A is false but \(R\) is true.

b

\(A\) is true but \(R\) is false.

c

Both \(A\) and \(R\) are true and \(R\) is the correct explanation of \(A\).

d

Both \(A\) and \(R\) are true but \(R\) is NOT the correct explanation of \(A\).

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Q4
PYQ

What is the rate of reaction of releasing carbon dioxide gas with aqueous sodium bicarbonate among the following? (memory based jee mains shift-1 28/01/2025)

(1) Picric acid

(2) Benzoic acid

(3) o-toluic acid

a

1 > 2 > 3

b

3 > 2 > 1

c

1 > 3 > 2

d

2 > 3 > 1

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Q5
PYQ

The products A and B obtained in the following reactions, respectively, are
\(3ROH+PC{l}_{3}\to 3RCl+A\\ ROH+PC{l}_{5}\to RCl+HCl+B\)

[NEET 2024]

a

\({H}_{3}P{O}_{3}\) and \(POC{l}_{3}\)

b

\(POC{l}_{3}\) and \({H}_{3}P{O}_{3}\)

c

\(POC{l}_{3}\) and \({H}_{3}P{O}_{4}\)

d

\({H}_{3}P{O}_{4}\) and \(POC{l}_{3}\)

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Q6
PYQ

Which of the following ether react with HBr to form phenol?

(PYQ-2025)

a

\(\mathrm{Ph}-{\mathrm{CH}}_{2}-\mathrm{O}-{\mathrm{CH}}_{2}-{\mathrm{CH}}_{3}\)

b

\(\mathrm{Ph}-{\mathrm{CH}}_{2}-{\mathrm{OCH}}_{3}\)

c

\(\\ {\mathrm{CH}}_{3}\\ \mathrm{Ph}-\mathrm{O}-\overset{|}{\underset{|}{\mathrm{C}}}-{\mathrm{CH}}_{3}\\ {\mathrm{CH}}_{3}\)

d

\(\mathrm{Ph}-{\mathrm{CH}}_{2}-\mathrm{O}-{\mathrm{CH}}_{2}-\mathrm{Ph}\)

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Q7
PYQ

What is the rate of reaction of releasing carbon dioxide gas with aqueous sodium bicarbonate among the following? (memory based jee mains shift-1 28/01/2025)

(1) Picric acid

(2) Benzoic acid

(3) o-toluic acid

a

1 > 2 > 3

b

3 > 2 > 1

c

1 > 3 > 2

d

2 > 3 > 1

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Q8
PYQ

An unknown alcohol is treated with ”Lucas reagent” to determine whether the alcohol is primary, secondary, or tertiary. Which alcohol reacts fastest and by what mechanism?

a

Secondary alcohol by \(S{N}^{1}\)

b

Tertiary alcohol by \(S{N}^{1}\)

c

Secondary alcohol by \(S{N}^{2}\)

d

Tertiary alcohol by \(S{N}^{2}\)

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Q9
PYQ

Which is ethoxy ethane?

a

\({\mathrm{C}}_{2}{\mathrm{H}}_{5}{\mathrm{OCH}}_{3}\)

b

\({\mathrm{CH}}_{3}{\mathrm{OCH}}_{3}\)

c

\({\mathrm{C}}_{2}{\mathrm{H}}_{5}{\mathrm{OC}}_{2}{\mathrm{H}}_{5}\)

d

None of these

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