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JEE • CHEMISTRY • ALCOHOLS & PHENOLS & ETHERS

Alcohols & phenols & ethers practice · Easy

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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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Showing 1-30 of 81 questions

1 Easy

1 of 81

Analyzing +4 | -1

Assertion (A): Isopropyl alcohol is preferred over ethanol.

Reason (R): Isopropyl alcohol is used as an antiseptic for skin before giving injections.

View answer and explanation

Correct option: B

Both

\mathrm{A}

and

\mathrm{R}

are correct;

\mathrm{R}

is not the correct explanation of

\mathrm{A}

Option B is correct because both the assertion and reason are correct, but the reason does not explain why isopropyl alcohol is preferred over ethanol in general.

2 Easy

2 of 81

Remembering +4 | -1

Germinated Barley (an enzyme) is a source of enzyme:

View answer and explanation

Correct option: B

Diastase

Option B (Diastase) is correct because germinated barley (malt) is a well-known source of the enzyme diastase, which breaks down starch into maltose.

3 Easy

3 of 81

Understanding +4 | -1

The process of converting alkyl halides into alcohols involves

View answer and explanation

Correct option: B

substitution reaction

Option B (substitution reaction) is correct because the hydroxyl group (OH) replaces the halogen atom (X) in the alkyl halide, which is the definition of a substitution reaction.

4 Easy

4 of 81

Remembering +4 | -1

The b.p. of alcohols are….than corresponding thiols.

View answer and explanation

Correct option: A

Option A (More) is correct because alcohols exhibit hydrogen bonding, which increases their boiling points compared to thiols, which only have weaker van der Waals forces.

5 Easy

5 of 81

Understanding +4 | -1

The boiling points of thio-ethers are…than those of ether.

View answer and explanation

Correct option: C

Higher

Option C (Higher) is correct because thioethers have higher molecular weights than ethers, leading to stronger van der Waals forces and higher boiling points.

6 Easy

6 of 81

Analyzing +4 | -1

Assertion: Ethers are non-polar when they are symmetrical.

Reason: Ethers have a bent structure.

View answer and explanation

Correct option: D

Assertion is wrong, but reason is correct statement.

Option D is correct. Ethers are polar due to the bent structure and the difference in electronegativity between oxygen and carbon, making the assertion wrong, but the reason is correct.

7 Easy

7 of 81

Analyzing +4 | -1

Which of the following is most acidic?

View answer and explanation

Correct option: C

p -

nitrophenol

Option C (

p -

nitrophenol) is the most acidic because the nitro group is a strong electron-withdrawing group, stabilizing the conjugate base.

8 Easy

8 of 81

Understanding +4 | -1

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

View answer and explanation

Correct option: A

Tertiary alcohol by 

S{N^2}

Option C (Tertiary alcohol by

S{N^1}

) is correct because tertiary alcohols react fastest with Lucas reagent via an

S{N^1}

mechanism due to the stability of the tertiary carbocation intermediate.

9 Easy

9 of 81

Remembering +4 | -1

Dialkyl sulphides are known as:

View answer and explanation

Correct option: C

Thioethers

Option C (Thioethers) is correct because dialkyl sulphides, with the general formula R-S-R', are also known as thioethers.

10 Easy

10 of 81

Remembering +4 | -1

Diethyl ether finds its use in medicine as:

View answer and explanation

Correct option: D

Anaesthetic

Option D is correct. Diethyl ether is used in medicine as an anaesthetic due to its ability to depress the central nervous system.

11 Easy

11 of 81

Remembering +4 | -1

Which of the following gives violet colour with an alcoholic solution of

\mathrm{FeC}{\mathrm{l}_3}?

View answer and explanation

Correct option: C

Salicylic acid

Option C (Salicylic acid) is correct because salicylic acid gives a violet color with an alcoholic solution of

\mathrm{FeC}{\mathrm{l}_3}

due to the presence of a phenolic group.

12 Easy

12 of 81

Understanding +4 | -1

Diethyl ether on heating with conc. HI gives two moles of

View answer and explanation

Correct option: C

Ethyl iodide

Option C (Ethyl iodide) is correct because diethyl ether reacts with concentrated HI to produce two moles of ethyl iodide.

13 Easy

13 of 81

Understanding +4 | -1

On boiling with conc. hydrobromic acid, phenylethylether will yield:

View answer and explanation

Correct option: A

Phenol and ethyl bromide

Option A (Phenol and ethyl bromide) is correct because the ether bond in phenylethylether is cleaved by HBr, resulting in phenol and ethyl bromide.

14 Easy

14 of 81

Understanding +4 | -1

There are four alcohols

P,\;Q,\;R\;\mathrm{and}\;S

which have 3, 2, 1 and zero alpha hydrogen atom(s). Which one of the following will not respond to Viktor-Meyer’s test?

View answer and explanation

Correct option: D

S

Option S is correct because tertiary alcohols (with zero alpha hydrogens) do not respond to the Victor Meyer's test.

15 Easy

15 of 81

Understanding +4 | -1

For drying ether sodium metal can be used, but it cannot be used for drying ethyl alcohol because:

View answer and explanation

Correct option: C

Ethyl alcohol reacts with sodium metal

Option C (Ethyl alcohol reacts with sodium metal) is correct because sodium reacts with ethyl alcohol to produce hydrogen gas, making it unsuitable for drying.

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16 Easy

16 of 81

Understanding +4 | -1

If methanol vapour is passed over heated copper at

{300^ \circ }C

, it forms formaldehyde by:

View answer and explanation

Correct option: B

Dehydrogenation

Option B (Dehydrogenation) is correct because methanol is converted to formaldehyde by the removal of hydrogen atoms.

17 Easy

17 of 81

Remembering +4 | -1

Phenol gives characteristic colouration with

View answer and explanation

Correct option: C

Aqueous

\mathrm{FeC}{\mathrm{I}_3}

solution

Option C (Aqueous

\mathrm{FeC}{\mathrm{I}_3}

solution) is correct because phenol gives a characteristic color with ferric chloride solution.

18 Easy

18 of 81

Application +4 | -1

Which compound is formed when sodium phenoxide is heated with ethyl iodide?

View answer and explanation

Correct option: A

Phenetole

Option A (Phenetole) is correct because the reaction of sodium phenoxide with ethyl iodide results in the formation of phenetole via Williamson ether synthesis.

19 Easy

19 of 81

Understanding +4 | -1

The ease of dehydrohalogenation of alkyl halide with alcoholic KOH is

View answer and explanation

Correct option: B

{3^ \circ } > {2^ \circ } > {1^ \circ }

Option B (

{3^ \circ } > {2^ \circ } > {1^ \circ }

) is correct because the ease of dehydrohalogenation follows the stability of the alkene formed, with tertiary alkyl halides forming more substituted and stable alkenes.

20 Easy

20 of 81

Understanding +4 | -1

When acetyl chloride is reduced with

\mathrm{LiAl}{\mathrm{H}_4}

, the product formed is:

View answer and explanation

Correct option: B

Ethyl alcohol

Option B (Ethyl alcohol) is correct because the reduction of acetyl chloride with

\mathrm{LiAl}{\mathrm{H}_4}

results in the formation of a primary alcohol, which is ethyl alcohol.

21 Easy

21 of 81

Understanding +4 | -1

Assertion: Methanol is called wood spirit.

Reason: Methanol can be prepared by the destructive distillation of fresh wood.

View answer and explanation

Correct option: A

Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.

The correct answer is A (Both assertion and reason are correct statements, and reason is the correct explanation of the assertion) because methanol is indeed called wood spirit and it can be prepared by the destructive distillation of wood.

22 Easy

22 of 81

Understanding +4 | -1

Among the following compounds, the strongest acid is:

View answer and explanation

Correct option: D

\mathrm{CH}_3 \mathrm{OH}

Option D (

\mathrm{CH}_3 \mathrm{OH}

) is the strongest acid among the given compounds because oxygen is more electronegative than carbon, leading to a more polar and easily ionizable O-H bond.

23 Easy

23 of 81

Remembering +4 | -1

Bisphenol A is

View answer and explanation

Correct option: C

Phenol + Acetone

Option C (Phenol + Acetone) is correct because Bisphenol A is synthesized from Phenol and Acetone.

24 Easy

24 of 81

Understanding +4 | -1

The compound

\mathrm{C}{\mathrm{H}_3}\mathrm{C}{\mathrm{H}_2}\mathrm{C}{\mathrm{H}_2}\mathrm{Br}

is converted into

\mathrm{C}{\mathrm{H}_3}\mathrm{C}{\mathrm{H}_2}\mathrm{C}{\mathrm{H}_2}\mathrm{OH}

by:

View answer and explanation

Correct option: D

Substitution

Option D (Substitution) is correct because the bromine atom in

\mathrm{C}{\mathrm{H}_3}\mathrm{C}{\mathrm{H}_2}\mathrm{C}{\mathrm{H}_2}\mathrm{Br}

is replaced by a hydroxyl group (OH) to form

\mathrm{C}{\mathrm{H}_3}\mathrm{C}{\mathrm{H}_2}\mathrm{C}{\mathrm{H}_2}\mathrm{OH}

25 Easy

25 of 81

Understanding +4 | -1

Which of the following compounds react immediately with Lucas reagent?

View answer and explanation

Correct option: D

{\text{C}}{{\text{H}}_3} - \mathop {\text{C}}\limits_{\begin{array}{cccccccccccccccccccc} | \\ {{\text{OH}}} \end{array}}^{\begin{array}{cccccccccccccccccccc} {{\text{C}}{{\text{H}}_3}} \\ | \end{array}} - {\text{C}}{{\text{H}}_3}

Option D is correct. Tertiary alcohols react immediately with Lucas reagent due to the formation of a stable tertiary carbocation.

26 Easy

26 of 81

Remembering +4 | -1

Metal alkoxides contain:

View answer and explanation

Correct option: B

Metal-oxygen bond

Option B (Metal-oxygen bond) is correct because metal alkoxides have the general formula

M-O-R

, where M is a metal, O is oxygen, and R is an alkyl group.

27 Easy

27 of 81

Analyzing +4 | -1

1-propanol and 2-propanol can be distinguished by

View answer and explanation

Correct option: C

Oxidation by heating with copper followed by reaction with Fehling solution

Option C is correct because oxidation with copper followed by reaction with Fehling's solution will distinguish between 1-propanol (which forms an aldehyde that reduces Fehling's) and 2-propanol (which forms a ketone that does not reduce Fehling's).

28 Easy

28 of 81

Remembering +4 | -1

The general formula of ether is:

View answer and explanation

Correct option: C

R

—

O

—

{R'}

Option C (

R

—

O

—

{R'}

) is correct because ethers are characterized by an oxygen atom bonded to two alkyl or aryl groups.

29 Easy

29 of 81

Remembering +4 | -1

The enzyme which can catalyse the conversion of glucose to ethanol is:

View answer and explanation

Correct option: A

Zymase

Option A (Zymase) is correct because zymase is an enzyme complex that catalyzes the fermentation of glucose to ethanol and carbon dioxide.

30 Easy

30 of 81

Remembering +4 | -1

Which of the following alcohols is made by fermentation?

View answer and explanation

Correct option: B

Ethanol

Option B (Ethanol) is correct because ethanol is commonly produced through the fermentation of sugars by yeast.

Revision notes and key takeaways

Review ALCOHOLS & PHENOLS & ETHERS in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 81 single-correct-answer MCQs on ALCOHOLS & PHENOLS & ETHERS.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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