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Ketones (R(1)COR(2)):R(1)=R(2)=alkyl gro...

Ketones `(R_(1)COR_(2)):R_(1)=R_(2)`=alkyl group, can be obtained in one step by

A

Hydrolysis of esters

B

Oxidation of `1^(@)` alcohol

C

Oxidation of `2^(@)` alcohol

D

Reaction of acid halides and alcohol

Text Solution

AI Generated Solution

The correct Answer is:
To determine how ketones can be obtained in one step from the given options, we will analyze each option step by step. ### Step-by-Step Solution: 1. **Understanding Ketones**: Ketones have the general structure \( R_1C(=O)R_2 \), where \( R_1 \) and \( R_2 \) are alkyl groups. Our goal is to find a method that allows us to synthesize ketones directly in one step. 2. **Option A: Hydrolysis of Esters**: - Hydrolysis of an ester involves breaking the ester bond to produce a carboxylic acid and an alcohol. - For example, if we take an ester \( R_1C(=O)OR_2 \) and hydrolyze it, we will get \( R_1COOH \) (carboxylic acid) and \( R_2OH \) (alcohol). - **Conclusion**: This reaction does not yield a ketone. Thus, this option is incorrect. 3. **Option B: Oxidation of Primary Alcohol**: - Oxidation of a primary alcohol \( RCH_2OH \) typically leads to the formation of an aldehyde. - For example, oxidizing \( RCH_2OH \) gives \( RCHO \) (aldehyde). - **Conclusion**: Since we are looking for ketones, this option is also incorrect. 4. **Option C: Oxidation of Secondary Alcohol**: - A secondary alcohol has the structure \( R_1CHOH R_2 \). - Upon oxidation, a secondary alcohol will convert to a ketone. For instance, oxidizing \( R_1CHOH R_2 \) will yield \( R_1C(=O)R_2 \) (ketone). - **Conclusion**: This is the correct method to obtain ketones in one step. 5. **Option D: Reaction of Acyl Halides with Alcohol**: - When an acyl halide (like acetyl chloride) reacts with an alcohol, it forms an ester. - For example, \( RCOCl + R_2OH \) yields \( RCOOR_2 \) (an ester). - **Conclusion**: This option does not produce a ketone, making it incorrect. ### Final Answer: The correct option for obtaining ketones in one step is **C: Oxidation of Secondary Alcohol**. ---
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Knowledge Check

  • Ketones (R-overset(O)overset("||")C-R') can be obtained in one step by (where R and R' are alkyl groups)

    A
    hydrolysis of esters
    B
    oxidation of primary alcohols
    C
    oxidation of secondary alcohols
    D
    reaction of alkyl halides with alcohols.

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