Preparation and properties of haloalkanes — NEET & JEE Questions

Question 1 · difficulty L1 · recall

Haloalkanes contain a halogen atom bonded to an

• A. sp3-hybridised carbon atom
• B. sp2 carbon of an aromatic ring only
• C. oxygen atom
• D. nitrogen atom

Question 2 · 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 3 · 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 4 · 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 5 · 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 6 · 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 7 · 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 8 · 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 9 · 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 10 · 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