Preparation and properties of haloalkanes — practice questions

Question 1 · difficulty L2 · understanding

Match the List-I with List-II List-I Chloro derivative List-II Example A. Vinyl Chloride I. CH$_2$ = CH - CH$_2$Cl B. Benzyl Chloride II. CH$_3$ - CH(Cl)CH$_3$ C. Alkyl Chloride III. CH$_2$ = CHCl D. Allyl Chloride IV. Choose the correct answer from the options given below :

• A. A-III, B-IV, C-I, D-II
• B. A-IV, B-I, C-III, D-II
• C. A-III, B-IV, C-II, D-I
• D. A-I, B-II, C-IV, D-III

Question 2 · difficulty L2 · understanding

Given below are two statements : Statement (I) : Alcohols are formed when alkyl chlorides are treated with aqueous potassium hydroxide by elimination reaction. Statement (II) : In alcoholic potassium hydroxide, alkyl chlorides form alkenes by abstracting the hydrogen from the $\beta$-carbon. In the light of the above statements, choose the most appropriate answer from the options given below :

• A. Both Statement I and Statement II are incorrect
• B. Both Statement I and Statement II are correct
• C. Statement I is incorrect but Statement II is correct
• D. Statement I is correct but Statement II is incorrect

Question 3 · difficulty L2 · understanding

Given below are two statements: Statement - I: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow $$\mathrm{S}_{\mathrm{N}}{ }^2$$ mechanism. Statement - II: A secondary alkyl halide when treated with a large excess of ethanol follows $$\mathrm{S}_{\mathrm{N}}{ }^1$$ mechanism. In the light of the above statements, choose the most appropriate from the options given below:

• A. Both Statement I and Statement II are true.
• B. Statement I is true but Statement II is false.
• C. Both Statement I and Statement II are false.
• D. Statement I is false but Statement II is true.

Question 4 · difficulty L2 · understanding

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : $$\mathrm{CH}_2=\mathrm{CH}-\mathrm{CH}_2-\mathrm{Cl}$$ is an example of allyl halide. Reason (R) : Allyl halides are the compounds in which the halogen atom is attached to $$\mathrm{sp}^2$$ hybridised carbon atom. In the light of the above statements, choose the most appropriate answer from the options given below :

• A. (A) is true but (R) is false
• B. (A) is false but (R) is true
• C. Both (A) and (R) are true but (R) is not the correct explanation of (A)
• D. Both (A) and (R) are true and (R) is the correct explanation of (A)

Question 5 · difficulty L2 · understanding

Alkyl halide is converted into alkyl isocyanide by reaction with

• A. $$\mathrm{KCN}$$
• B. $$\mathrm{NH}_4 \mathrm{CN}$$
• C. $$\mathrm{NaCN}$$
• D. $$\mathrm{AgCN}$$

Question 6 · difficulty L2 · understanding

Which among the following halide/s will not show $$\mathrm{S_N 1}$$ reaction: (A) $$\mathrm{H}_2 \mathrm{C}=\mathrm{CH}-\mathrm{CH}_2 \mathrm{Cl}$$ (B) $$\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{Cl}$$ (C) (D) Choose the most appropriate answer from the options given below :

• A. (B) and (C) only
• B. (A), (B) and (D) only
• C. (B) only
• D. (A) and (B) only

Question 7 · difficulty L2 · understanding

The major product in the reaction

• A. t-Butyl ethyl ether
• B. 2,2-Dimethyl butane
• C. 2-Methyl pent-1-ene
• D. 2-Methyl prop-1-ene

Question 8 · difficulty L2 · understanding

The correct pair(s) of the ambident nucleophiles is(are) (A) AgCN/KCN (B) RCOOAg/RCOOK (C) AgNO 2 /KNO 2 (D) AgI/KI

• A. (B) and (C) only
• B. (B) only
• C. (A) and (C) only
• D. (A) only

Question 9 · difficulty L3 · understanding

Given below are two statements : Statement I : Due to increase in van der Waals forces, the order of boiling points is $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{I}>\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{I}>\mathrm{CH}_3 \mathrm{I}$. $$\text { Statement II : }$$ In the light of the above statements, choose the correct answer from the options given below :

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Question 10 · difficulty L3 · understanding

Correct statements regarding alkyl halides (R–X) among the following are : A. Alcohol being less polar solvent as compared to water, alcoholic KOH favours elimination reaction with R–X. B. Order of reactivity towards S N 1 mechanism is C 6 H 5 –CH 2 –Cl > C 6 H 5 –CHCl–C 6 H 5 . C. Non substituted aryl halides exhibit properties similar to alkyl halides. D. Vinyl chloride is an example of haloalkene and allyl chloride is an example of haloalkyne. E. R–Cl can be prepared by reacting R–OH with SOCl 2 but Ar–Cl cannot be prepared by reacting Ar–OH with SOCl 2 . Choose the correct answer from the options given below :

• A. A, B and C Only
• B. B and D Only
• C. A and E Only
• D. D and E Only