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NEET • CHEMISTRY • HALOALKANES AND HALO ARENES

Haloalkanes and halo arenes practice · Medium

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31 Medium

31 of 45

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 (

\mathrm{NaHS}

) is correct because NaHS (sodium hydrosulfide) will react with ethyl bromide to form ethanethiol through a nucleophilic substitution reaction.

32 Medium

32 of 45

Remembering +4 | -1

Protin solvent is

View answer and explanation

Correct option: D

Ethanol

Option D (Ethanol) is correct because protic solvents are those that contain an O-H or N-H bond, and ethanol (

C_2H_5OH

) has an O-H bond.

33 Medium

33 of 45

Understanding +4 | -1

Amongst the following which of the above are true for

{S_N}2\;

reaction?
(i) The rate of reaction is independent of the concentration of the nucleophile.

(ii) The nucleophile attacks the carbon atom on the side of the molecule opposite to the group being displaced.

(iii) the reaction proceeds with simultaneous bond formation and bond rupture

View answer and explanation

Correct option: D

(ii), (iii)

Option D ((ii), (iii)) is correct because S\N2 reactions are bimolecular, meaning the rate depends on both the substrate and nucleophile, and they proceed with inversion of configuration through a transition state.

34 Medium

34 of 45

Remembering +4 | -1

Incorrect match is

View answer and explanation

Correct option: D

DDT – Fat insoluble

Option D (DDT – Fat insoluble) is the incorrect match because DDT is actually fat-soluble, which is one of the reasons it accumulates in the environment and in living organisms.

35 Medium

35 of 45

Remembering +4 | -1

Ulmann’s reaction is used for the preparation of:

View answer and explanation

Correct option: A

Diphenyl

Option A (Diphenyl) is correct because Ullmann's reaction involves the coupling of aryl halides in the presence of copper to form biaryls, such as diphenyl.

36 Medium

36 of 45

Analyzing +4 | -1

\mathrm{C}{\mathrm{H}_3}\mathrm{Br\;} + \mathrm{\;N}{\mathrm{u}^ - }\mathrm{\;} \to \mathrm{C}{\mathrm{H}_3} - \mathrm{Nu} + \mathrm{B}{\mathrm{r}^ - }

. The decreasing order of the rate of the above reaction with nucleophiles (

\mathrm{N}{\mathrm{u}^ - })\mathrm{\;}A{\kern 1pt} {\kern 1pt} \mathrm{\;to\;}{\kern 1pt} {\kern 1pt} D

is :

\left[ {\mathrm{N}{\mathrm{u}^ - }\mathrm{\;} = \mathrm{\;}\left( A \right)\mathrm{Ph}{\mathrm{O}^ - },\mathrm{\;}\left( B \right)\mathrm{Ac}{\mathrm{O}^ - },\left( C \right)\mathrm{H}{\mathrm{O}^ - },\left( D \right)\mathrm{C}{\mathrm{H}_3}{\mathrm{O}^ - }} \right]

View answer and explanation

Correct option: B

D > C > B > A

Option A is correct because the reactivity of nucleophiles in SN2 reactions depends on their basicity and steric hindrance. More basic and less hindered nucleophiles are more reactive.

37 Medium

37 of 45

Analyzing +4 | -1

Bottles containing

{C}_6 {H}_5 {I}

and

{C}_6 {H}_5 {CH}_2 {I}

lost their original labels. They were labelled

A

and

B

for testing.

A

and

B

were separately taken in test tubes and boiled with

{NaOH}

solution. The end solution in each tube was made acidic with dilute

{HNO}_3

and then some

{AgNO}_3

solution was added. Substance

{B}

gave a yellow precipitate. Which one of the following statements is true for this experiment ?

View answer and explanation

Correct option: D

A

was

{C}_6 {H}_5 {I}

Option D (

A

was

{C}_6 {H}_5 {I}

) is correct because phenyl iodide will react with NaOH to produce iodide ions, which will then precipitate with silver nitrate as yellow AgI.

38 Medium

38 of 45

Understanding +4 | -1

Which of the following does not react with benzene in presence of anhydrous

\mathrm{AlC}{\mathrm{l}_3}

View answer and explanation

Correct option: A

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

Option A (

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

) does not react with benzene in the presence of anhydrous

AlCl_3

because the resulting phenyl cation is highly unstable and does not readily form.

39 Medium

39 of 45

Application +4 | -1

Ethyl chloride on heating with AgCN forms a compound X. The functional isomer of X is

View answer and explanation

Correct option: C

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

Option C (

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

) is correct because ethyl chloride reacts with AgCN to form ethyl isocyanide (

C_2H_5NC

), and the functional isomer of ethyl isocyanide is ethyl cyanide (

C_2H_5CN

40 Medium

40 of 45

Remembering +4 | -1

Chloroform on reaction with conc.

\mathrm{HN}{\mathrm{O}_3}

gives an insecticide and war gas known as:

View answer and explanation

Correct option: A

Chloropicrin

Option A (Chloropicrin) is correct because chloroform reacts with concentrated nitric acid to produce chloropicrin, which is both an insecticide and a war gas.

41 Medium

41 of 45

Application +4 | -1

Which of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?

View answer and explanation

Correct option: C

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

Option C (

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

) is correct because it does not contain either the

CH_3CO-

CH_3CH(OH)-

group required for a positive iodoform test.

42 Medium

42 of 45

Understanding +4 | -1

In a

S{N^2}

Substitution reaction, which of the following has the highest relative rate

View answer and explanation

Correct option: D

C{H_3}C{H_2}Br

Option D (

C{H_3}C{H_2}Br

) is correct because S\N2 reactions are favored by less steric hindrance, and ethyl bromide is the least sterically hindered among the given options.

43 Medium

43 of 45

Understanding +4 | -1

Aryl halides are less reactive towards electrophiles than alkyl halides due to:

View answer and explanation

Correct option: A

Resonance

Option A (Resonance) is correct because aryl halides exhibit resonance, which stabilizes the molecule and makes the carbon-halogen bond stronger, thus less reactive towards electrophiles.

44 Medium

44 of 45

Understanding +4 | -1

C{H_3}C{H_2}C{H_2}Br + NaCN \to C{H_3}C{H_2}C{H_2}CN + NaBr

The above reaction will occur at fastest rate in

View answer and explanation

Correct option: D

DMF

Option D (DMF) is correct because DMF is a polar aprotic solvent, which favors SN2 reactions by solvating the cation but not the anion, thus increasing the nucleophilicity of CN-.

45 Medium

45 of 45

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 the polymerization of alkenes typically proceeds through a free radical mechanism, especially when initiated by peroxides or high temperatures.

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