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The reactant 'P' in the following reacti...

The reactant 'P' in the following reactions is `P underset(dil.H_2SO_4)overset(K_2Cr_2O_7)rarrBunderset(H_3O^+)overset(CH_3MgBr)rarrCH_3-underset(OH)underset(|)overset(CH_3)overset(|)C-CH_3`

A

`CH_3CHOHCH_3`

B

`CH_3COCH_3`

C

`CH_3CH_2OH`

D

`CH_3COOH`

Text Solution

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The correct Answer is:
To determine the reactant 'P' in the given reactions, we can break down the steps involved in the reactions and analyze the products formed. ### Step-by-Step Solution: 1. **Identify the Reaction Conditions**: The reactant 'P' is subjected to two main reactions: - First, it reacts with `K2Cr2O7` in the presence of `dil. H2SO4`. - Second, it reacts with `CH3MgBr` (a Grignard reagent) followed by hydrolysis with `H3O+`. 2. **Understanding the First Reaction**: The first reaction involves oxidation. `K2Cr2O7` is a strong oxidizing agent, and in acidic medium (dilute H2SO4), it can oxidize alcohols to ketones or aldehydes. - Since the final product after the Grignard reaction is a tertiary alcohol, 'P' must be a secondary alcohol or an aldehyde that can be oxidized to a ketone. 3. **Predicting the Product**: The product formed after the first reaction with `K2Cr2O7` is likely to be acetone (CH3COCH3), which is a ketone. This suggests that 'P' could be 2-propanol (isopropyl alcohol, CH3CHOHCH3). 4. **Understanding the Second Reaction**: The second part of the reaction involves the Grignard reagent `CH3MgBr`. When a Grignard reagent reacts with a ketone, it forms a magnesium alkoxide intermediate. - In this case, the ketone (acetone) would react with `CH3MgBr` to form a tertiary alcohol after hydrolysis. 5. **Final Product Formation**: The Grignard reagent adds a methyl group to the carbonyl carbon of acetone, leading to the formation of a tertiary alcohol: - The reaction can be summarized as: - `CH3COCH3 + CH3MgBr → CH3C(OH)(CH3)CH3` (after hydrolysis) - This product is 2-methyl-2-propanol (tert-butyl alcohol). 6. **Conclusion**: Based on the analysis, the reactant 'P' is 2-propanol (isopropyl alcohol), which upon oxidation gives acetone, and then reacts with the Grignard reagent to form the tertiary alcohol. ### Final Answer: The reactant 'P' is **2-propanol (isopropyl alcohol)**.
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