The ${{\rm{S}}_{\rm{N}}}$1 reactivity of ethyl chloride is:

More or less equal to that of benzyl chloride

More or less equal to that of chlorobenzene

Less than that of chlorobenzene

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JEE • CHEMISTRY • HALOALKANES AND HALO ARENES

Haloalkanes and halo arenes practice · Medium

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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 95 questions

1 Medium

1 of 95

Understanding +4 | -1

In electrophilic substitution reaction of chlorobenzene, the chloro group:

View answer and explanation

Correct option: D

Gives ortho/para substituted product.

Option D (Gives ortho/para substituted product) is correct because the chloro group is an ortho/para directing group due to resonance, even though it is deactivating due to its inductive effect.

2 Medium

2 of 95

Remembering +4 | -1

Polymerization of alkenes takes place through

View answer and explanation

Correct option: D

S\,{N^2}

mechanism

Option A (free radical mechanism) is correct because polymerization of alkenes typically proceeds through a free radical mechanism.

3 Medium

3 of 95

Analyzing +4 | -1

Assertion (A): The boiling points of alkyl halides decrease in the order:

RI > {R B r} > {R C I} > {R F}

.

Reason (R): The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.

View answer and explanation

Correct option: B

Both A and R are correct; R is not the correct explanation of A

Option B (Both A and R are correct; R is not the correct explanation of A) is correct because both the boiling point trend of alkyl halides and the higher boiling points compared to comparable hydrocarbons are true, but the latter doesn't explain the former.

4 Medium

4 of 95

Application +4 | -1

In order to get ethanethiol from

{\mathrm{C}_2}{\mathrm{H}_5}\mathrm{Br},

the reagent used is:

View answer and explanation

Correct option: B

\mathrm{NaHS}

Option B (NaHS) is correct because NaHS reacts with ethyl bromide to form ethanethiol via a nucleophilic substitution reaction.

5 Medium

5 of 95

Remembering +4 | -1

Solvent used in dry-cleaning of clothes is:

View answer and explanation

Correct option: C

Carbon tetrachloride

Option C (Carbon tetrachloride) is correct because carbon tetrachloride (

CCl_4

) was historically used as a solvent in dry-cleaning due to its ability to dissolve fats, oils, and grease.

6 Medium

6 of 95

Remembering +4 | -1

Which of the following statements is true for chloroform?

View answer and explanation

Correct option: B

People develop sores when skin is immersed in chloroform

Option B (People develop sores when skin is immersed in chloroform) is correct because chloroform can cause skin irritation and sores upon prolonged exposure.

7 Medium

7 of 95

Understanding +4 | -1

Which of the following statements is correct for allylic halide?

View answer and explanation

Correct option: B

Compound in which halogen atom is bonded to an

s p^3

-hybridised carbon atom next to carbon-carbon double bond, i.e.

(\mathrm{C}=\mathrm{C})

Option B is correct because allylic halides are defined as compounds where the halogen atom is bonded to an

sp^3

-hybridized carbon atom next to a carbon-carbon double bond.

8 Medium

8 of 95

Remembering +4 | -1

When chloroform is exposed to light and air, it forms

View answer and explanation

Correct option: C

Phosgene gas

Option C (Phosgene gas) is correct because chloroform reacts with oxygen in the presence of light to form phosgene, a poisonous gas.

9 Medium

9 of 95

Remembering +4 | -1

{\mathrm{S}_\mathrm{N}}1

reaction, the first step involves the formation of:

View answer and explanation

Correct option: C

Carbocation

Option C (Carbocation) is correct because the first step of an SN1 reaction involves the formation of a carbocation intermediate.

10 Medium

10 of 95

Remembering +4 | -1

Which of the following effects is/are caused by exposure to

\mathrm{CCl}_4

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because exposure to CCl₄ can cause liver cancer, damage to nerve cells, and coma/unconsciousness.

11 Medium

11 of 95

Remembering +4 | -1

The synthesis of alkyl fluorides is best accomplished by

View answer and explanation

Correct option: D

Swarts reaction

Option D (Swarts reaction) is correct because Swarts reaction is the best method for synthesizing alkyl fluorides using metal fluorides.

12 Medium

12 of 95

Understanding +4 | -1

The

{\mathrm{S}_\mathrm{N}}

1 reactivity of ethyl chloride is:

View answer and explanation

Correct option: B

Less than that of benzyl chloride

Option B (Less than that of benzyl chloride) is correct because benzyl chloride forms a more stable carbocation intermediate due to resonance, facilitating SN1 reactions.

13 Medium

13 of 95

Application +4 | -1

The set of reagents for the conversion of Aniline to 2, 4, 6 – tribromo fluorobenzene are

View answer and explanation

Correct option: A

\left( {\text{i}} \right)\,B{r_2}/{H_2}O\,\,\left( {{\text{ii}}} \right)NaN{O_2}/HCl - {0^ \circ }\;C\,\,\left( {{\text{iii}}} \right)\,HB{F_4},\Delta

Option A

\left( {\text{i}} \right)\,B{r_2}/{H_2}O\,\,\left( {\text{{ii}}} \right)NaN{O_2}/HCl - {0^ \circ }\;C\,\,\left( {\text{{iii}}} \right)\,HB{F_4},\Delta

is correct because it describes the correct sequence of reactions: bromination of aniline, diazotization, and then fluorination.

14 Medium

14 of 95

Remembering +4 | -1

In common name system, gem–dihalides are called
_____ and vicinal-dihalides are called _____.

View answer and explanation

Correct option: B

Alkylidene halides and alkylene halides

Option B is correct because gem-dihalides are called alkylidene halides, and vicinal-dihalides are called alkylene halides.

15 Medium

15 of 95

Understanding +4 | -1

Which of the following will react with water:

View answer and explanation

Correct option: B

{Cl}_3 {CCHO}

The correct answer is B (

{Cl}_3 {CCHO}

) because it has a highly polarized carbonyl group that can readily react with water to form a stable hydrate.

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16 Medium

16 of 95

Analyzing +4 | -1

Assertion (A):

\mathrm{KCN}

react with

\mathrm{R}-\mathrm{X}

to give cyanide and

\mathrm{AgCN}

reacts with

\mathrm{R}-\mathrm{X}

to give isocyanide mainly.
Reason (R):

\mathrm{KCN}

and

\mathrm{AgCN}

both are ionic compounds

View answer and explanation

Correct option: C

Assertion is true and Reason is false

Option C (Assertion is true and Reason is false) is correct because KCN is predominantly ionic and attacks through carbon, while AgCN is more covalent and attacks through nitrogen. The reason incorrectly states that both are ionic.

17 Medium

17 of 95

Remembering +4 | -1

Which is the best solvent to use for the solvolysis reaction of t- butyl chloride?

View answer and explanation

Correct option: A

Water

Option A (Water) is correct because

S_N1

reactions, like the solvolysis of t-butyl chloride, are favored by polar protic solvents such as water.

18 Medium

18 of 95

Remembering +4 | -1

Which of the following reagent is used for the following reaction?

C{H_3}C{H_2}C{H_3}\xrightarrow{?}C{H_3}C{H_2}CHO

View answer and explanation

Correct option: B

Molybdenum oxide

Option B (Molybdenum oxide) is correct because molybdenum oxide is used as a catalyst for the oxidation of alkanes to aldehydes.

19 Medium

19 of 95

Analyzing +4 | -1

Which one of the following is excellent substrate for

\text{SN}^1

reaction?

View answer and explanation

Correct option: C

\left(\mathrm{CH}_3\right)_2 \mathrm{~N}-\mathrm{CH}_2 \mathrm{Cl}

Option C is correct because the carbocation formed in the SN1 reaction is stabilized by the delocalization of electrons from the nitrogen atom.

20 Medium

20 of 95

Understanding +4 | -1

Isobutyl chloride and butyl chloride are:

View answer and explanation

Correct option: B

Chain isomers

The correct answer is B (Chain isomers) because isobutyl chloride and butyl chloride have the same molecular formula but differ in the arrangement of the carbon chain.

21 Medium

21 of 95

Understanding +4 | -1

Which is finally produced when acetylene reacts with HCl?

View answer and explanation

Correct option: B

\mathrm{C}{\mathrm{H}_3}\mathrm{CHC}{\mathrm{l}_2}

Option B is correct because the reaction of acetylene with HCl proceeds in two steps, eventually forming 1,1-dichloroethane (CH3CHCl2).

22 Medium

22 of 95

Analyzing +4 | -1

S-I: Styrene on reaction with

{HBr}

gives 1-bromo-1-phenylethane.

S-II: Benzyl radical is more stable than alkyl radical.

View answer and explanation

Correct option: A

Both S-I and S-II are correct

Option D is correct. S-I is wrong because Styrene on reaction with HBr gives 1-bromo-2-phenylethane, and S-II is correct because the benzyl radical is more stable than the alkyl radical due to resonance.

23 Medium

23 of 95

Understanding +4 | -1

Which of the following when heated with KOH and primary amine gives carbylamine test?

View answer and explanation

Correct option: A

\mathrm{CHC}{\mathrm{l}_3}

Option A (CHCl3) is correct because chloroform (CHCl3) reacts with a primary amine and KOH to produce an isocyanide, which has a foul smell, indicating a positive carbylamine test.

24 Medium

24 of 95

Remembering +4 | -1

Methyl ketone is identified by

View answer and explanation

Correct option: A

Iodoform test

Option A (Iodoform test) is correct because methyl ketones give a positive iodoform test, producing a yellow precipitate.

25 Medium

25 of 95

Remembering +4 | -1

Iso-butylene can be converted into tert-butyl bromide by its reaction with

View answer and explanation

Correct option: A

HBr

Option A (

HBr

) is correct because the reaction of iso-butylene with

HBr

follows Markovnikov's rule, leading to the formation of tert-butyl bromide.

26 Medium

26 of 95

Remembering +4 | -1

For the compounds

CH _3 Cl , CH _3 Br , CH _3I

and

CH _3 F

, the correct order of increasing C -halogen bond length is :

View answer and explanation

Correct option: C

CH _3 F< CH _3 Cl < CH _3 Br < CH _3 I

Option C is correct because the C-halogen bond length increases as the size of the halogen increases, following the order F < Cl < Br < I.

27 Medium

27 of 95

Application +4 | -1

Following is the substitution reaction in which –CN replaces –Cl.

\mathrm{R} - \mathrm{Cl} + \mathrm{KCN}\xrightarrow{\Delta }\mathrm{R} - \mathrm{CN} + \mathrm{KCl}

alcoholic

To obtain propanenitrile,

\mathrm{R\;}-\mathrm{\;Cl}

should be

View answer and explanation

Correct option: A

Chloroethane

Option A (Chloroethane) is correct because chloroethane reacts with KCN to directly produce propanenitrile.

28 Medium

28 of 95

Understanding +4 | -1

Iodoform is formed when ethanol is heated with:

View answer and explanation

Correct option: B

Iodine and aqueous potassium hydroxide

Option B (Iodine and aqueous potassium hydroxide) is correct because ethanol reacts with iodine and aqueous potassium hydroxide to form iodoform in the iodoform test.

29 Medium

29 of 95

Application +4 | -1

1-phenyl, 2-chloropropane on treatment with aqueous

\mathrm{KOH}

gives mainly:

View answer and explanation

Correct option: C

1-phenylpropan-2-ol

Option C (1-phenylpropan-2-ol) is correct because the reaction of 1-phenyl, 2-chloropropane with aqueous KOH leads to nucleophilic substitution, replacing the chlorine with a hydroxyl group.

30 Medium

30 of 95

Understanding +4 | -1

The statement that is not true about ozone is

View answer and explanation

Correct option: A

in the stratosphere, CFCs release chlorine free radicals

Cl,

which reacts with

{O_3}

to give chlorine dioxide radicals

Option A (in the stratosphere, CFCs release chlorine free radicals

Cl,

which reacts with

{O_3}

to give chlorine dioxide radicals) is correct because the reaction of chlorine free radicals with ozone produces chlorine monoxide radicals, not chlorine dioxide radicals.

Revision notes and key takeaways

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Key Takeaways

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