The product formed in the reaction of H$X$ with ${\left( {{\rm{C}}{{\rm{H}}_3}} \right)_2}{\rm{C}}$=${\rm{C}}{{\rm{H}}_2}$ is:

${\left( {{\rm{C}}{{\rm{H}}_3}} \right)_2}{\rm{C}}X{\rm{C}}{{\rm{H}}_3}$

${\left( {{\rm{C}}{{\rm{H}}_3}} \right)_2}{\rm{CH}} \cdot {\rm{C}}{{\rm{H}}_2}X$

${\left( {{\rm{C}}{{\rm{H}}_3}} \right)_2}{\rm{CHC}}{{\rm{H}}_3}$

${\left( {{\rm{C}}{{\rm{H}}_3}} \right)_2}{\rm{C}}X{\rm{C}}{{\rm{H}}_2}X$

$\mathrm{CH}_3 \mathrm{CH}(\mathrm{Br}) \mathrm{CH}_2(\mathrm{Br})$

$\mathrm{CH}_2(\mathrm{Br}) \mathrm{CH}_2 \mathrm{CH}_2$

$\mathrm{CH}_2 \mathrm{BrCH}_2 \mathrm{Br}$

The order of reactivities of the following alkyl halides for a ${{\rm{S}}_{\rm{N}}}2$ reaction is :

$R{\rm{I}}\; > \;R{\rm{Br\;}} > \;R{\rm{Cl}}\; > \;R{\rm{F}}$

$R{\rm{F}}\; > \;R{\rm{Cl\;}} > \;R{\rm{Br}}\; > \;R{\rm{I}}$

$R{\rm{F}}\; > \;R{\rm{Br\;}} > \;R{\rm{Cl}}\; > \;R{\rm{I}}$

$R{\rm{Cl}}\; > \;R{\rm{Br\;}} > \;R{\rm{F}}\; > \;R{\rm{I}}$

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NEET • CHEMISTRY • HALOALKANES AND HALO ARENES

Haloalkanes and halo arenes practice · Easy

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1 Easy

1 of 36

Understanding +4 | -1

Most reactive compound towards nucleophilic addition among the following is

View answer and explanation

Correct option: D

HCHO

Option D (HCHO) is the most reactive towards nucleophilic addition because it has the least steric hindrance and the carbonyl carbon is most electrophilic.

2 Easy

2 of 36

Remembering +4 | -1

The bad smelling substance formed by the action of alcoholic caustic potash on chloroform and aniline is:

View answer and explanation

Correct option: A

Phenyl isocyanide

Option A (Phenyl isocyanide) is correct because the reaction of chloroform with aniline in the presence of alcoholic KOH is the carbylamine reaction, which produces phenyl isocyanide (also known as phenyl isonitrile), which has a very unpleasant odor.

3 Easy

3 of 36

Remembering +4 | -1

Chlorobenzene is prepared commercially by:

View answer and explanation

Correct option: B

Raschig process

Option B (Raschig process) is correct because the Raschig process is an industrial process for the production of chlorobenzene from benzene, HCl, and oxygen.

4 Easy

4 of 36

Understanding +4 | -1

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

mechanism for the reaction,

R - X + \mathrm{KOH}\; \to R\mathrm{OH} + \mathrm{K}X

follow :

View answer and explanation

Correct option: A

Carbocation mechanism

Option A (Carbocation mechanism) is correct because the

S_N1

mechanism involves the formation of a carbocation intermediate in the rate-determining step.

5 Easy

5 of 36

Application +4 | -1

The product formed in the reaction of H

X

with

{\left( {\mathrm{C}{\mathrm{H}_3}} \right)_2}\mathrm{C}

\mathrm{C}{\mathrm{H}_2}

is:

View answer and explanation

Correct option: A

{\left( {\mathrm{C}{\mathrm{H}_3}} \right)_2}\mathrm{C}X\mathrm{C}{\mathrm{H}_3}

Option A (

{\left( {\mathrm{C}{\mathrm{H}_3}} \right)_2}\mathrm{C}X\mathrm{C}{\mathrm{H}_3}

) is correct because the addition of HX to an alkene follows Markovnikov's rule, where the hydrogen adds to the carbon with more hydrogens, and the halogen adds to the more substituted carbon.

6 Easy

6 of 36

Remembering +4 | -1

Lacrymator or tear gas is:

View answer and explanation

Correct option: C

{\mathrm{C}_6}{\mathrm{H}_5}\mathrm{COC}{\mathrm{H}_2}\mathrm{Cl}

Option C (

{\mathrm{C}_6}{\mathrm{H}_5}\mathrm{COC}{\mathrm{H}_2}\mathrm{Cl}

) is correct because

\alpha

-chloroacetophenone is a well-known lachrymator (tear gas).

7 Easy

7 of 36

Understanding +4 | -1

Gem-dibromide is

View answer and explanation

Correct option: B

\mathrm{CH}_3 \mathrm{CBr}_2 \mathrm{CH}_3

Option B (

\mathrm{CH}_3 \mathrm{CBr}_2 \mathrm{CH}_3

) is correct because gem-dibromides have two bromine atoms on the same carbon atom.

8 Easy

8 of 36

Remembering +4 | -1

DDT is obtained by the reaction of chlorobenzene with

View answer and explanation

Correct option: A

Chloral

Option A (Chloral) is correct because DDT is synthesized by reacting chlorobenzene with chloral in the presence of concentrated sulfuric acid.

9 Easy

9 of 36

Analyzing +4 | -1

Which of the following will have the maximum dipole moment?

View answer and explanation

Correct option: B

{CH}_3 {Cl}

Option B (

{CH}_3 {Cl}

) is correct because dipole moment depends on both electronegativity difference and bond length, and the C-Cl bond provides the optimal balance between these factors.

10 Easy

10 of 36

Understanding +4 | -1

Which of the following does not answer iodoform test?

View answer and explanation

Correct option: A

N-butyl alcohol

Option A (N-butyl alcohol) does not answer the iodoform test because it does not contain a

CH_3CO-

group or a

CH_3CH(OH)-

group.

11 Easy

11 of 36

Remembering +4 | -1

For the carbylamine reaction we need hot alcoholic KOH and:

View answer and explanation

Correct option: D

Any monoalkyl amine and trichloro methane

Option D is correct because the carbylamine reaction requires a primary amine, chloroform (trichloromethane), and hot alcoholic KOH.

12 Easy

12 of 36

Understanding +4 | -1

Assertion : Exposure of ultraviolet rays to human causes the skin cancer, disorder and disrupt the immune system.

Reason : Carbon tetrachloride is released into air it rises to atmosphere and deplets the ozone layer.

View answer and explanation

Correct option: B

Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Option B (Assertion is correct, reason is correct; reason is not a correct explanation for assertion) is correct because both statements are true, but the reason does not explain the assertion.

13 Easy

13 of 36

Understanding +4 | -1

Which of the following undergoes nucleophilic substitution exclusively

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

mechanism?

View answer and explanation

Correct option: A

Benzyl chloride

Option A (Benzyl chloride) is correct because benzyl carbocations are stabilized by resonance with the benzene ring, favoring the S\N1 mechanism.

14 Easy

14 of 36

Remembering +4 | -1

Iodoform is obtained when ethanol is heatd with

View answer and explanation

Correct option: B

{\mathrm{I}_2}

and aq. KOH

Option B (

{\mathrm{I}_2}

and aq. KOH ) is correct because iodoform is produced when ethanol reacts with iodine and aqueous KOH in the iodoform reaction.

15 Easy

15 of 36

Analyzing +4 | -1

Arrange decreasing order of reactivity of these compounds for nucleophilic substitution reaction.

\left( {\text{I}} \right)\,\,\,C{H_3}C{H_2} - O - \begin{array}{cccccccccccccccccccc} O \\ {||} \\ S \\ {||} \\ O \end{array} - C{F_3}

\left( {{\text{II}}} \right)\,\,\,C{H_3} - C{H_2} - OTs

\left( {{\text{III}}} \right)\,\,\,C{H_3} - \mathop {CH}\limits_{\begin{array}{cccccccccccccccccccc} | \\ {OH} \end{array}} - C{H_3}

\left( {{\text{IV}}} \right)\,\,\,C{H_3} - \mathop {CH}\limits_{\begin{array}{cccccccccccccccccccc} | \\ {{C_6}{H_5}} \end{array}} - OH

View answer and explanation

Correct option: D

>

>

>

III

Option D is correct because the reactivity order in nucleophilic substitution depends on the leaving group ability and steric hindrance. I and II have better leaving groups than III and IV, and I is better than II.

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16 Easy

16 of 36

Understanding +4 | -1

The order of reactivities of the following alkyl halides for a

{\mathrm{S}_\mathrm{N}}2

reaction is :

View answer and explanation

Correct option: D

R\mathrm{I}\; > \;R\mathrm{Br\;} > \;R\mathrm{Cl}\; > \;R\mathrm{F}

Option D (

R\mathrm{I}\; > \;R\mathrm{Br\;} > \;R\mathrm{Cl}\; > \;R\mathrm{F}

) is correct because the reactivity of alkyl halides in

S_N2

reactions increases as the size of the halogen increases, due to the weakening of the C-X bond.

17 Easy

17 of 36

Understanding +4 | -1

Following reaction,

{\left( {\mathrm{C}{\mathrm{H}_3}} \right)_3}\mathrm{CBr} + {\mathrm{H}_2}\mathrm{O} \to {\left( {\mathrm{C}{\mathrm{H}_3}} \right)_3}\mathrm{COH} + \mathrm{HBr}

is an example of

View answer and explanation

Correct option: C

Nucleophilic substitution

Option C (Nucleophilic substitution) is correct because the reaction involves the substitution of a leaving group (Br) by a nucleophile (H2O), which is a characteristic of nucleophilic substitution reactions.

18 Easy

18 of 36

Remembering +4 | -1

Lodoform can be used in medicine as:

View answer and explanation

Correct option: B

Antiseptic

Option B (Antiseptic) is correct because iodoform is known for its antiseptic properties due to the slow liberation of iodine.

19 Easy

19 of 36

Application +4 | -1

When the concentration of alkyl halide is triple and concentration of

\mathop {\text{O}}\limits^\ominus {\text{H}}

is reduced to half, the rate of

\mathrm{SN}_2

reaction increased by:

View answer and explanation

Correct option: B

1.5 times

Option B (1.5 times) is correct because the rate of an

SN_2

reaction is directly proportional to the concentration of the alkyl halide and the nucleophile. Tripling the alkyl halide concentration increases the rate by a factor of 3, while halving the hydroxide concentration decreases the rate by a factor of 2, resulting in a net increase of 3/2 = 1.5 times.

20 Easy

20 of 36

Analyzing +4 | -1

C{H_3} - \begin{array}{cccccccccccccccccccc} {C{H_3}} \\ | \\ C \\ | \\ {C{H_3}} \end{array} - Br + KOH\left( {aq} \right) \to C{H_3} - \begin{array}{cccccccccccccccccccc} {C{H_3}} \\ | \\ C \\ | \\ {C{H_3}} \end{array} - OH + KBr

Above reaction is

View answer and explanation

Correct option: A

S{N^1}

Option A is correct because the reaction involves a tertiary alkyl halide, which favors SN1 mechanism due to the formation of a stable tertiary carbocation.

21 Easy

21 of 36

Application +4 | -1

Butane nitrile may be prepared by heating:

View answer and explanation

Correct option: D

Propyl chloride with KCN

Option D (Propyl chloride with KCN) is correct because the reaction of propyl chloride with KCN via an S\N2 mechanism will yield butane nitrile.

22 Easy

22 of 36

Remembering +4 | -1

1,2-dibromoethane is added to prevent deposition of lead metal in :

View answer and explanation

Correct option: B

Petrol engines

Option B (Petrol engines) is correct because 1,2-dibromoethane is added to petrol to convert lead deposits into volatile lead bromide, preventing lead fouling in engines.

23 Easy

23 of 36

Remembering +4 | -1

The green house gas/es is (are)
A) Carbon dioxide

\,\,\,\,\,\,\,\,\,\,\,\,

B) Oxygen

\,\,\,\,\,\,\,\,\,\,\,\,

C) Water vapour

\,\,\,\,\,\,\,\,\,\,\,\,

D) Methane
Choose the most appropriate answer from the options given below.

View answer and explanation

Correct option: C

(A), (C) and (D)

Option C ((A), (C) and (D)) is correct because Carbon dioxide, Water vapour, and Methane are all well-known greenhouse gases that contribute to global warming.

24 Easy

24 of 36

Application +4 | -1

Which of the following will not give positive iodoform test?

View answer and explanation

Correct option: C

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

Option C (

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

) is correct because it does not contain a

CH_3CO-

group or a

CH_3CH(OH)-

group, both of which are necessary for a positive iodoform test.

25 Easy

25 of 36

Understanding +4 | -1

The alkyl halide which is most reactive towards dehydrogalogenation is

View answer and explanation

Correct option: D

R-I

Option D (R-I) is correct because the C-I bond is the weakest, making it easiest to break during dehydrohalogenation.

26 Easy

26 of 36

Understanding +4 | -1

Iso-propyl chloride undergoes hydrolysis by

View answer and explanation

Correct option: C

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

and

{S_N}2

mechanisms

Option A (

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

mechanism) is correct because isopropyl chloride, being a secondary alkyl halide, can undergo hydrolysis via both

S_N1

and

S_N2

mechanisms, with

S_N1

being more favored due to the formation of a relatively stable secondary carbocation.

27 Easy

27 of 36

Application +4 | -1

Ethyl bromide and isopropyl chloride can be distinguished by:

View answer and explanation

Correct option: A

Alcoholic

\mathrm{AgN}{\mathrm{O}_3}

Option A (Alcoholic

\mathrm{AgN}{\mathrm{O}_3}

) is correct because the rate of formation of AgBr and AgCl will be different due to the different nature of the alkyl halides (primary vs. secondary).

28 Easy

28 of 36

Remembering +4 | -1

Which is not present in Grignard reagent?

View answer and explanation

Correct option: A

Carboxylic radical represented by COOH

Option A (Carboxylic radical represented by COOH) is correct because Grignard reagents have the general formula RMgX, where R is an alkyl or aryl group, Mg is magnesium, and X is a halogen. They do not contain a carboxylic acid group.

29 Easy

29 of 36

Analyzing +4 | -1

Assertion (A):

SN^2

mechanism is accompanied by racemisation.

Reason (R): In

{S}{{N}}^2

mechanism, nucleophile attaches itself on opposite side, where halogen atom is present.

View answer and explanation

Correct option: D

A is incorrect; R is correct

Option D is correct because SN2 mechanism results in inversion of configuration, not racemization. The nucleophile attacks from the opposite side of the leaving group.

30 Easy

30 of 36

Application +4 | -1

Which compound can produce chloropicrin with

{Cl}_2, {NaOH}

View answer and explanation

Correct option: A

Nitromethane

Option A (Nitromethane) is correct because it reacts with chlorine and sodium hydroxide to produce chloropicrin (

CCl_3NO_2

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Key Takeaways

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