Question

Identify the correct order of organic compounds in the following chemical reaction:

(A) CH₃MgBr
(B) CH₃Br
(C) CH₃Cl
(D) CH₄
Choose the correct answer from the options given below:

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

Answer 1

The Correct Option is C

To determine the correct order, we need to understand the typical reaction pathways involving these compounds:

(C) CH3Cl (Chloromethane): This is a simple alkyl halide. It can undergo various reactions, including reactions with magnesium metal.

(B) CH3Br (Bromomethane): Similar to chloromethane, this is also an alkyl halide. It can react with magnesium metal in dry ether to form a Grignard reagent.

(A) CH3MgBr (Methylmagnesium bromide): This is a Grignard reagent, a highly reactive organometallic compound. It's formed by reacting an alkyl halide (like CH3Br) with magnesium metal. Grignard reagents are powerful nucleophiles and bases.

(D) CH4 (Methane): This is an alkane, a relatively unreactive hydrocarbon. It can be formed by the reaction of a Grignard reagent with a proton source (like water or an acid).

Based on these reactions, the logical order is:

1. An alkyl halide (CH3Br or CH3Cl) reacts with magnesium.
2. This forms the Grignard reagent (CH3MgBr).
3. The Grignard reagent can then react with a proton source to form methane (CH4).

Considering the given options:

Option 3: (B), (A), (C), (D) is the most logical sequence, as it follows the Grignard reagent formation and then its reaction to form methane. Option 1 is also a possible order but option 3 is better because CH3Br reacts more readily with Mg than CH3Cl. Also, option 3 does not place CH3Cl in the Grignard reaction sequence.

Therefore, the correct answer is:

Option 3: (B), (A), (C), (D)