NEET
- Exam
- NEET
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- Chemistry
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- Aldehydes and Ketones
NEET · Chemistry · Aldehydes and Ketones
Given below are two statements; one is labelled as Assertion (A)...
Given below are two statements; one is labelled as Assertion (A) and the other is labelled as Reason(R).
Assertion: All ketones on reaction with Grignard reagent, followed by hydrolysis yield tertiary alcohols.
Reason: All aldehydes on reaction with Grignard reagent followed by hydrolysis yield secondary alcohols.
In the light of the above statements, choose the most appropriate answer from the options given below :
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A).
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A).
- C(A) is correct but (R) is not correct.
- D(A) is not correct but (R) is correct.
Correct answer
B. Both (A) and (R) are correct but (R) is not the correct explanation of (A).
Step-by-step solution
The assertion (A) states that all ketones on reaction with Grignard reagents, followed by hydrolysis, yield tertiary alcohols. This is correct. Ketones react with Grignard reagents to form a tertiary alcohol after hydrolysis.
The reason (R) states that all aldehydes on reaction with Grignard reagents followed by hydrolysis yield secondary alcohols. This is also correct. Aldehydes react with Grignard reagents to form secondary alcohols after hydrolysis.
However, ((\mathrm{R})) does not provide a correct explanation for ((\mathrm{A})), as the mechanisms for ketones and aldehydes are different and the reason pertains specifically to aldehydes.
Thus, the most appropriate answer is: (2) Both (A) and (R) are correct but (R) is not the correct explanation of (A).