When benzene sulphonic acid and $p - $nitrophenol are treated with ${\rm{NaHC}}{{\rm{O}}_3}$, the gases released respectively are:

${\rm{N}}{{\rm{O}}_2},{\rm{\;C}}{{\rm{O}}_2}$

${\rm{S}}{{\rm{O}}_2},{\rm{\;N}}{{\rm{O}}_2}$

${\rm{S}}{{\rm{O}}_2},{\rm{\;NO}}$

${\rm{S}}{{\rm{O}}_2},{\rm{\;C}}{{\rm{O}}_2}$

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NEET • CHEMISTRY • ALCOHOLS & PHENOLS & ETHERS

Alcohols & phenols & ethers practice · Mixed difficulty

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Showing 1-30 of 180 questions

1 Easy

1 of 180

Remembering +4 | -1

Ethers are made free from peroxide linkage on distilling impure sample with:

View answer and explanation

Correct option: B

Conc.

{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}

Option D (None of these) is correct because ethers are made free from peroxide linkage on distilling impure sample with aqueous ferrous salt solution.

2 Hard

2 of 180

Application +4 | -1

The product 'B' in the following reaction is

{\text{C}}{{\text{H}}_3}{\text{C}}{{\text{H}}_2}{\text{OH}}\xrightarrow{{{\text{PCC}}}}{\text{A}}\xrightarrow[{\left( {{\text{ii}}} \right){\text{ }}{{\text{H}}_2}{\text{O/}}{{\text{H}}^ + }}]{{\left( {\text{i}} \right){\text{ HCN}}}}{\text{B}}

View answer and explanation

Correct option: D

Both (2) and (3)

Option D (Both (2) and (3)) is correct because the reaction sequence involves oxidation of ethanol to ethanal, followed by reaction with HCN to form a cyanohydrin, which upon hydrolysis yields

\alpha

-Hydroxy propionic acid, also known as Lactic acid.

3 Easy

3 of 180

Remembering +4 | -1

Fenton’s reagent is:

View answer and explanation

Correct option: B

{\mathrm{H}_2}{\mathrm{O}_2} + \mathrm{FeS}{\mathrm{O}_4}

Option B (

{\mathrm{H}_2}{\mathrm{O}_2} + \mathrm{FeS}{\mathrm{O}_4}

) is correct because Fenton's reagent is a solution of hydrogen peroxide and ferrous sulfate, used for oxidation.

4 Hard

4 of 180

Analyzing +4 | -1

Assertion:- Isopropyl benzene reacts with

\mathrm{O}_2

and acid gives phenol.

Reason:- Initially isopropyl benzene converts into 2-phenyl propan-2-ol.

View answer and explanation

Correct option: D

If both Assertion & reason are False

Option D is correct because isopropyl benzene reacts with oxygen in the presence of a catalyst to give phenol and acetone. The initial product is cumene hydroperoxide, not 2-phenylpropan-2-ol.

5 Hard

5 of 180

Understanding +4 | -1

When an ether is treated with

{\mathrm{P}_2}{\mathrm{S}_5}

we get:

View answer and explanation

Correct option: C

Thio-ether

Option C (Thio-ether) is correct because

{\mathrm{P}_2}{\mathrm{S}_5}

replaces oxygen with sulfur in ethers, forming thioethers.

6 Medium

6 of 180

Understanding +4 | -1

Physical properties of:

View answer and explanation

Correct option: A

Alcohols lie between alkanes and

{\mathrm{H}_2}\mathrm{O}

Option A (Alcohols lie between alkanes and

{\mathrm{H}_2}\mathrm{O}

) is correct because alcohols have intermediate polarity due to the presence of both alkyl and hydroxyl groups, resulting in physical properties between those of nonpolar alkanes and highly polar water.

7 Hard

7 of 180

Analyzing +4 | -1

Find out product

(X)

Ph - CH = C{H_2}\xrightarrow[{\begin{array}{cccccccccccccccccccc} {\left(2 \right)\,HBr} \\ {\left(3 \right)\,Mg,{\text{ dry ether}}} \\ {\left(4 \right)\,HCHO} \end{array}}]{{\left(1 \right){B_2}{H_6}/{\text{THF/}}{H_2}{O_2}/O{H^ - }}}X\left( {{\text{major}}} \right)

View answer and explanation

Correct option: D

{Ph}-{CH}_2-{CH}_2-{CH}_2-{OH}

Option D (

{Ph}-{CH}_2-{CH}_2-{CH}_2-{OH}

) is correct because the hydroboration-oxidation of styrene gives 2-phenylethanol, which then reacts with HBr to give 1-bromo-2-phenylethane. This reacts with Mg to form a Grignard reagent, which then reacts with formaldehyde to give 3-phenylpropan-1-ol.

8 Easy

8 of 180

Analyzing +4 | -1

An organic liquid

A

containing C, H and O has a pleasant odour with a b.p. of

{78^ \circ }C

. On boiling

A

with conc.

{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}

a colourless gas is produced which decolourises bromine water and alkaline

\mathrm{KMn}{\mathrm{O}_4}

. One mole of this gas also takes one mole of

{\mathrm{H}_2}

. The organic liquid A is:

View answer and explanation

Correct option: D

{\mathrm{C}_2}{\mathrm{H}_5}\mathrm{OH}

Option D (

{\mathrm{C}_2}{\mathrm{H}_5}\mathrm{OH}

) is correct because ethanol dehydrates to ethene, which decolourises bromine water and alkaline

\mathrm{KMn}{\mathrm{O}_4}

9 Medium

9 of 180

Analyzing +4 | -1

{CH}_3 {OC}_2 {H}_5

and

\left({CH}_3\right)_3 {C}-{OCH}_3

are treated with hydroiodic acid. The fragments obtained after reactions are

View answer and explanation

Correct option: A

{CH}_3 {I}+{HOC}_2 {H}_5 ;\left({CH}_3\right)_3 {Cl}+{HOCH}_3

Option A (

{CH}_3 {I}+{HOC}_2 {H}_5 ;\left({CH}_3\right)_3 {Cl}+{HOCH}_3

) is correct because HI cleaves ethers, with the iodide attacking the less hindered alkyl group. In the case of tert-butyl methyl ether, the reaction proceeds via

S_N1

mechanism due to the stability of the tert-butyl carbocation.

10 Hard

10 of 180

Application +4 | -1

When benzene sulphonic acid and

p -

nitrophenol are treated with

\mathrm{NaHC}{\mathrm{O}_3}

, the gases released respectively are:

View answer and explanation

Correct option: D

\mathrm{N}{\mathrm{O}_2},\mathrm{\;C}{\mathrm{O}_2}

The correct answer is D (

\mathrm{N}{\mathrm{O}_2},\mathrm{\;C}{\mathrm{O}_2}

) because benzene sulfonic acid is a strong acid that doesn't react with NaHCO3 to release CO2, while p-nitrophenol is acidic enough to react with NaHCO3 to release CO2.

11 Hard

11 of 180

Application +4 | -1

Among the following, the number of compounds which will not give positive iodoform reaction is

(i) 1- Phenylbutane-2-one

(ii) 2-Methylbutan-2-ol

(iii) 3-Methylbutan-2-ol

(iv) 1-Phenylethanol

(v) 3,3-Dimethylbutan-2-one

(vi) 1-Phenylpropan-2-ol

View answer and explanation

Correct option: A

The correct answer is 2. Compounds that do NOT give a positive iodoform test are those lacking a methyl ketone or a secondary alcohol that can be oxidized to a methyl ketone.

12 Easy

12 of 180

Analyzing +4 | -1

Which of the following statements regarding phenols is not correct?

View answer and explanation

Correct option: C

Phenols are soluble in both aqueous

\mathrm{NaOH}

and aqueous

\mathrm{NaHC}{\mathrm{O}_3}

Option C (Phenols are soluble in both aqueous

\mathrm{NaOH}

and aqueous

\mathrm{NaHC}{\mathrm{O}_3}

) is not correct because phenols are soluble in aqueous NaOH due to the formation of sodium phenoxide, but they are not soluble in aqueous NaHCO3 because they are weaker acids than carbonic acid.

13 Easy

13 of 180

Understanding +4 | -1

R-\mathrm{COOH} \to R\mathrm{C}{\mathrm{H}_2}\mathrm{OH}

. This mode of reduction can be effected only by:

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because

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

Na\mathrm{ } + \mathrm{ }Alcohol

, and

\mathrm{NaB}{\mathrm{H}_4}

can all reduce carboxylic acids to primary alcohols, although

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

is the most common and powerful reducing agent for this transformation.

14 Easy

14 of 180

Application +4 | -1

3 moles of ethanol react with one mole of phosphorus tribromide to form 3 moles of bromoethane and one mole of

{X}

. Which of the following is

{X}

View answer and explanation

Correct option: D

{H}_3 {PO}_3

Option D (

{H}_3 {PO}_3

) is correct because the reaction of ethanol with phosphorus tribromide produces bromoethane and phosphorous acid (

{H}_3 {PO}_3

15 Hard

15 of 180

Understanding +4 | -1

Diethyl ether and n-propyl methyl ether are

View answer and explanation

Correct option: A

Metamers

Option A (Metamers) is correct because diethyl ether (

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

) and n-propyl methyl ether (

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

) have the same molecular formula but different alkyl groups attached to the oxygen atom.

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16 Easy

16 of 180

Application +4 | -1

The product C in the following sequence of reaction,

{\mathrm{C}_2}{\mathrm{H}_5}\mathrm{Br}\xrightarrow{{\mathrm{NaOH\;}\left( {aq} \right)}}A\mathop \to \limits^{\mathrm{Na}} B\xrightarrow{{\mathrm{C}{\mathrm{H}_3}\mathrm{I}}}C

is:

View answer and explanation

Correct option: C

Methyl ethyl ether

Option C (Methyl ethyl ether) is correct because the reaction sequence involves converting ethyl bromide to ethanol, then to sodium ethoxide, and finally reacting with methyl iodide to form methyl ethyl ether (Williamson ether synthesis).

17 Easy

17 of 180

Analyzing +4 | -1

Among the following, which is least acidic?

View answer and explanation

Correct option: B

o

-cresol

Option B (

o

-cresol) is correct because the methyl group is electron-donating, destabilizing the phenoxide ion and thus decreasing acidity compared to phenol and halogens/nitro groups which are electron withdrawing.

18 Medium

18 of 180

Understanding +4 | -1

Phenol,

p

-methylphenol,

m

-nitrophenol and

p

-nitrophenol follows order of increasing strength as

View answer and explanation

Correct option: B

p

-methylphenol, pheol,

m

-nitrophenol,

p

-nitrophenol

Option B (

p

-methylphenol, phenol,

m

-nitrophenol,

p

-nitrophenol) is correct because electron-donating groups decrease acidity, while electron-withdrawing groups increase acidity, and nitro groups are stronger electron-withdrawing groups than methyl groups are electron-donating.

19 Medium

19 of 180

Application +4 | -1

2 mole of ethanol are burnt. The amount of

\mathrm{C}{\mathrm{O}_2}

obtained will be:

View answer and explanation

Correct option: C

176 g

Option C (176 g) is correct because 2 moles of ethanol produce 4 moles of CO2, which corresponds to 176 g.

20 Medium

20 of 180

Analyzing +4 | -1

Assertion: Hydroquinone is more acidic than resorcinol.

Reason:

OH

shows

-I

effect

View answer and explanation

Correct option: D

If both the Assertion and Reason are incorrect.

Option D (If both the Assertion and Reason are incorrect) is correct because hydroquinone is less acidic than resorcinol, and the -I effect of OH is not the primary reason for the difference in acidity.

21 Medium

21 of 180

Remembering +4 | -1

A diazonium chloride reacts with

\phi \mathrm{OH}

to give an azodye. The reaction is called

View answer and explanation

Correct option: C

Coupling

Option C is correct because the reaction of a diazonium chloride with phenol to form an azodye is called a coupling reaction.

22 Medium

22 of 180

Remembering +4 | -1

The organic compound present in tincture of iodine is:

View answer and explanation

Correct option: A

Alcohol

Option A is correct because tincture of iodine is a solution of iodine in alcohol.

23 Easy

23 of 180

Analyzing +4 | -1

Phenol can be distinguished from ethanol by the following reagents except

View answer and explanation

Correct option: A

Sodium

Option A (Sodium) is correct because both phenol and ethanol react with sodium to liberate hydrogen gas, so it cannot be used to distinguish between them.

24 Hard

24 of 180

Understanding +4 | -1

Diethyl ether is decomposed on heating with:

View answer and explanation

Correct option: D

\mathrm{HI}

Option D (HI) is correct because HI cleaves ethers to form alkyl halides and alcohols.

25 Easy

25 of 180

Understanding +4 | -1

Which is not an alcohol?

View answer and explanation

Correct option: D

{\mathrm{C}_6}{\mathrm{H}_5}\mathrm{OH}

Option D (

{\mathrm{C}_6}{\mathrm{H}_5}\mathrm{OH}

) is correct because it represents phenol, where the OH group is directly attached to the benzene ring, making it an aromatic alcohol (phenol) rather than an aliphatic alcohol.

26 Medium

26 of 180

Application +4 | -1

Which of the following compounds when heated with CO at 150

^ \circ C

and 500 atm pressure in presence of

\mathrm{B}{\mathrm{F}_3}

forms ethyl propionate?

View answer and explanation

Correct option: C

{\mathrm{C}_2}{\mathrm{H}_5}\mathrm{O}{\mathrm{C}_2}{\mathrm{H}_5}

Option C (

{\mathrm{C}_2}{\mathrm{H}_5}\mathrm{O}{\mathrm{C}_2}{\mathrm{H}_5}

) is correct because diethyl ether reacts with CO in the presence of BF3 to form ethyl propionate.

27 Easy

27 of 180

Analyzing +4 | -1

Which of the following is most acidic?

View answer and explanation

Correct option: C

p -

nitrophenol

Option C (

p -

nitrophenol) is correct because the nitro group is a strong electron-withdrawing group, which stabilizes the phenoxide ion after deprotonation, making it the most acidic.

28 Hard

28 of 180

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 because dehydration of alcohols typically occurs in acidic medium, and OH- is a poor leaving group.

29 Hard

29 of 180

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 sodium ethoxide reacts with bromoethane via Williamson ether synthesis to form ethoxyethane.

30 Hard

30 of 180

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

Option C is correct because the reaction of ethyl magnesium bromide with 3-pentanone will produce 3-ethylpentan-3-ol after hydrolysis.

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Key Takeaways

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