1. ⇒ (MHT CET 2023 12th May Evening Shift )

Which of the following gases is formed during oxidation of trichloromethane?

A. ${CO}_{(g)}$

B. ${CO}_{2 (g)}$

C. ${COCl}_{2 (g)}$

D. $H_{2 (g)}$

Correct Option is (C)

Chloroform (trichloromethane) when exposed to air and light forms a poisonous compound phosgene $({COCl}_{2})$ so it is stored in dark coloured air tight bottles.

2. ⇒ (MHT CET 2023 12th May Evening Shift )

Which of the following compounds has difficulty in breaking of $C - X$ bond during nucleophilic substitution reaction?

A. o-Nitrochlorobenzene

B. p-Nitrochlorobenzene

C. m-Nitrochlorobenzene

D. 2,4,6-Trinitrochlorobenzene

Correct Option is (C)

Greater the number of electron withdrawing groups at o/p position, greater is the reactivity towards nucleophilic substitution reaction. Electron withdrawing group at meta position has practically no effect on reactivity. Hence, among the given, m-nitrochlorobenzene has difficulty in breaking of $C - X$ bond during nucleophilic substitution.

3. ⇒ (MHT CET 2023 12th May Morning Shift )

Which of the following compounds does NOT undergo Williamson's synthesis?

A. $C_{2} H_{5} - Cl$

B. MHT CET 2023 12th May Morning Shift Chemistry - Haloalkanes and Haloarenes Question 3 English Option 2

C. $C_{6} H_{5} - Cl$

D. ${CH}_{3} - {CH}_{2} - {CH}_{2} - Cl$

Correct Option is (C)

Aryl halides do not give Williamson's synthesis.

4. ⇒ (MHT CET 2023 12th May Morning Shift )

Identify major product $A$ in following reaction.

3-Bromo-2-methylpentane $⟶_{Δ}^{alc . KOH}$ A

A. 2-Methylpentan-3-ol

B. 2-Methylpent-2-ene

C. 4-Methylpent-3-ene

D. 4-Methylpentan-3-ol

Correct Option is (B)

When alkyl halide having at least one $β$ -hydrogen is boiled with alcoholic solution of potassium hydroxide, it undergoes elimination of hydrogen atom from $β$ -carbon and halogen atom from $α$ -carbon resulting in the formation of an alkene. This reaction is known as dehydrohalogenation reaction or $β$ -elimination. The preferred product is that alkene which has greater number of alkyl groups attached to doubly bonded carbon atoms according to Saytzeff rule.

MHT CET 2023 12th May Morning Shift Chemistry - Haloalkanes and Haloarenes Question 5 English Explanation

5. ⇒ (MHT CET 2023 11th May Evening Shift )

Identify the final product formed on ammonolysis of benzyl chloride followed by the reaction with two moles of ${CH}_{3} I$ .

A. $C_{6} H_{5} {CH}_{2} {NHCH}_{3}$

B. $C_{6} H_{5} {CH}_{2} {NH}_{2}$

C. $C_{6} H_{5} N {({CH}_{3})}_{2}$

D. $C_{6} H_{5} {CH}_{2} N {({CH}_{3})}_{2}$

Correct Option is (D)

MHT CET 2023 11th May Evening Shift Chemistry - Haloalkanes and Haloarenes Question 8 English Explanation

⇒ Halogen Derivatives