
In the reaction

The compound ‘B’ is
(A) Acetic acid
(B) Acetone
(C) Acetaldehyde
(D) Ethyl alcohol
Answer
164.1k+ views
Hint: The reaction of nitrile with Grignard reagent will result in the formation of compound ‘A’. This compound ‘A’ will then get hydrolysed to form the compound ‘B’. We have to identify the final compound ‘B’ formed after hydrolysis.
Complete Step by Step Solution:
The reaction involves the reaction between the nitrile group and the Grignard reagent.
Firstly, we should understand the nature of the nitrile group. The nitrile group (or cyano group) is electron-withdrawing in nature. The nitrile ($-CN$) group is less basic than other nitrogen-containing compounds such as amines. It is polar in nature. The Grignard reagent ($RMgX$) is prepared by the reaction of an alkyl halide ($RX$) with magnesium ($Mg$). The Grignard reagent helps in the formation of carbon-carbon bonds.
The first step of the reaction is the nucleophilic attack of the Grignard reagent. The reaction between nitrile and Grignard reagent proceeds through the formation of imines. This will get hydrolysed to yield a ketone. So, as in the given reaction, methyl cyanide ($C{{H}_{3}}CN$) is treated with methyl magnesium iodide ($RMgI$), and an imines is formed. This will get hydrolysed and yield acetone ($C{{H}_{3}}COC{{H}_{3}}$ )

Hence, in the above reaction, the compound ‘B’ is acetone ($C{{H}_{3}}COC{{H}_{3}}$ ).
Correct Option: (B) Acetone.
Note: The Grignard reagent ($RMgX$) on treatment with carbon dioxide ($CO_{2}^{{}}$) can form a carboxylic acid ($RCOOH$ ). Also, on treatment of acyl chlorides with dialkyl cadmium, prepared by the reaction of cadmium chloride with Grignard reagent, gives ketones.
Complete Step by Step Solution:
The reaction involves the reaction between the nitrile group and the Grignard reagent.
Firstly, we should understand the nature of the nitrile group. The nitrile group (or cyano group) is electron-withdrawing in nature. The nitrile ($-CN$) group is less basic than other nitrogen-containing compounds such as amines. It is polar in nature. The Grignard reagent ($RMgX$) is prepared by the reaction of an alkyl halide ($RX$) with magnesium ($Mg$). The Grignard reagent helps in the formation of carbon-carbon bonds.
The first step of the reaction is the nucleophilic attack of the Grignard reagent. The reaction between nitrile and Grignard reagent proceeds through the formation of imines. This will get hydrolysed to yield a ketone. So, as in the given reaction, methyl cyanide ($C{{H}_{3}}CN$) is treated with methyl magnesium iodide ($RMgI$), and an imines is formed. This will get hydrolysed and yield acetone ($C{{H}_{3}}COC{{H}_{3}}$ )

Hence, in the above reaction, the compound ‘B’ is acetone ($C{{H}_{3}}COC{{H}_{3}}$ ).
Correct Option: (B) Acetone.
Note: The Grignard reagent ($RMgX$) on treatment with carbon dioxide ($CO_{2}^{{}}$) can form a carboxylic acid ($RCOOH$ ). Also, on treatment of acyl chlorides with dialkyl cadmium, prepared by the reaction of cadmium chloride with Grignard reagent, gives ketones.
Recently Updated Pages
JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Atomic Structure and Chemical Bonding important Concepts and Tips

JEE Amino Acids and Peptides Important Concepts and Tips for Exam Preparation

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

Chemical Properties of Hydrogen - Important Concepts for JEE Exam Preparation

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

Atomic Structure - Electrons, Protons, Neutrons and Atomic Models

Displacement-Time Graph and Velocity-Time Graph for JEE

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Learn About Angle Of Deviation In Prism: JEE Main Physics 2025

Types of Solutions

Other Pages
JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

NCERT Solutions for Class 12 Chemistry Chapter 1 Solutions

Solutions Class 12 Notes: CBSE Chemistry Chapter 1

NCERT Solutions for Class 12 Chemistry Chapter 6 Haloalkanes and Haloarenes

NCERT Solutions for Class 12 Chemistry Chapter 2 Electrochemistry

Electrochemistry Class 12 Notes: CBSE Chemistry Chapter 2
