The correct structure of C is
The Correct Option is A
Approach Solution - 1
To determine the correct structure of compound C, we need to understand the reaction steps involved in the given chemical transformation. Here's the breakdown:
First, we have an organic molecule with a cyanide group: \(CH_3CH_2CN\).
The first reaction involves the addition of Grignard reagent \(CH_3MgBr\) in ether to form compound A. Grignard reagents add to nitriles to form ketones after hydrolysis. Specifically, the reaction can be explained as:
\(CH_3CH_2CN + CH_3MgBr \rightarrow CH_3CH_2C(=NMgBr)CH_3 \xrightarrow[\text{}]{H_3O^+} CH_3CH_2COCH_3\)
Next, compound A is hydrolyzed with \(H_3O^+\) to form compound B, which is a ketone: \(CH_3CH_2COCH_3\).
Compound B then undergoes Clemmensen reduction, which involves treatment with Zn-Hg and HCl to reduce the carbonyl group to a methylene group. The transformation can be summarized as:
\(CH_3CH_2COCH_3 \xrightarrow[\text{Zn-Hg}]{HCl} CH_3CH_2CH_2CH_3\)
Thus, the correct structure of C is butane (\(CH_3CH_2CH_2CH_3\)).
The given image of option A correctly represents this structure:
Approach Solution -2
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Concepts Used:
Preparation - Alcohols, Phenols and Ethers
Alcohols, phenols, and ethers are organic compounds that can be prepared by various methods.
Preparation of Alcohols:
- Direct hydration of alkenes: Alcohols can be prepared by the addition of water to an alkene in the presence of a strong acid catalyst.
- Reduction of carbonyl compounds: Alcohols can be prepared by the reduction of aldehydes, ketones, or carboxylic acids using reducing agents like NaBH4 or LiAlH4.
- Grignard reaction: Alcohols can be prepared by reacting Grignard reagents with carbonyl compounds.
- Hydroboration-oxidation: Alcohols can be prepared by the hydroboration of alkenes followed by oxidation with an oxidizing agent like H2O2.
Preparation of Phenols:
- Hydrolysis of diazonium salts: Phenols can be prepared by the hydrolysis of diazonium salts, which are formed by the reaction of aniline with nitrous acid.
- Oxidation of sulfonic acids: Phenols can be prepared by the oxidation of sulfonic acids using strong oxidizing agents like potassium permanganate or chromic acid.
Preparation of Ethers:
- Williamson synthesis: Ethers can be prepared by the reaction of an alkoxide ion with a primary alkyl halide or tosylate in the presence of a strong base like NaOH or KOH.
- Dehydration of alcohols: Ethers can be prepared by the dehydration of alcohols in the presence of a strong acid catalyst like H2SO4.
In summary, alcohols, phenols, and ethers can be prepared by a variety of methods, including hydration, reduction, Grignard reaction, hydroboration-oxidation, hydrolysis, oxidation, Williamson synthesis, and dehydration. The choice of the method depends on the availability of starting materials, the desired product, and the conditions of the reaction.