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For the sequence of reactions, A underse...

For the sequence of reactions, `A underset("ether")overset(C_(2)H_(5)MgI)rarr B overset(H_(2)O //H^(+))rarr` tert-Pentyl alcohol. The compound A in the sequence is :

A

2-Butanone

B

Acetaldehyde

C

Acetone

D

Propanal

Text Solution

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The correct Answer is:
To solve the question, we need to identify the compound A that, when reacted with ethyl magnesium iodide (C2H5MgI), leads to the formation of tert-pentyl alcohol after hydrolysis. ### Step-by-Step Solution: 1. **Understanding the Final Product**: The final product is tert-pentyl alcohol, which has the structure (CH3)3C-OH. This indicates that the starting compound A must be capable of forming a tertiary alcohol upon reaction. 2. **Identifying the Reaction**: The reaction involves a Grignard reagent (C2H5MgI) reacting with a carbonyl compound. Grignard reagents react with carbonyl groups to form alcohols. 3. **Determining the Structure of A**: To form tert-pentyl alcohol, the carbonyl compound A should be such that when it reacts with the Grignard reagent, it produces a tertiary alcohol. The carbonyl compound that fits this description is acetone (CH3COCH3). 4. **Reaction Mechanism**: - When acetone (A) reacts with the Grignard reagent (C2H5MgI), the nucleophilic ethyl group (C2H5-) attacks the carbonyl carbon of acetone. - This results in the formation of a magnesium alkoxide intermediate: \[ CH3C(OH)(C2H5)MgI \] - Upon hydrolysis (treatment with H2O/H+), the alkoxide is converted to tert-pentyl alcohol: \[ (CH3)3C-OH \] 5. **Conclusion**: Therefore, the compound A in the sequence of reactions is acetone. ### Final Answer: The compound A in the sequence is acetone (CH3COCH3). ---
To solve the question, we need to identify the compound A that, when reacted with ethyl magnesium iodide (C2H5MgI), leads to the formation of tert-pentyl alcohol after hydrolysis. ### Step-by-Step Solution: 1. **Understanding the Final Product**: The final product is tert-pentyl alcohol, which has the structure (CH3)3C-OH. This indicates that the starting compound A must be capable of forming a tertiary alcohol upon reaction. 2. **Identifying the Reaction**: The reaction involves a Grignard reagent (C2H5MgI) reacting with a carbonyl compound. Grignard reagents react with carbonyl groups to form alcohols. ...
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