Question:
Given below are two statements :
Statement I : The condensation reaction between $CH_3-CH=O$ and 
Statement II : The molecule, 
In the light of the above statements, choose the correct answer from the options given below :
Given below are two statements :
Statement I : The condensation reaction between $CH_3-CH=O$ and
Statement II : The molecule,
In the light of the above statements, choose the correct answer from the options given below :
Statement I : The condensation reaction between $CH_3-CH=O$ and
Statement II : The molecule,
In the light of the above statements, choose the correct answer from the options given below :
Updated On: Apr 12, 2026
- Both Statement I and Statement II are true
- Both Statement I and Statement II are false
- Statement I is true but Statement II is false
- Statement I is false but Statement II is true
Show Solution
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Statement I refers to the nucleophilic addition-elimination reaction of carbonyls with ammonia derivatives. Statement II refers to the instability of hemiacetals in acidic media.
Step 2: Detailed Explanation:
Statement I: Acetaldehyde ($CH_3CHO$) reacts with semicarbazide ($NH_2NHCONH_2$) to form a semicarbazone. The reaction is a condensation (loss of $H_2O$) and occurs optimally at pH 3.5. Thus, Statement I is True.
Statement II: The given molecule is a hemiacetal (formed from benzaldehyde and methanol). Hemiacetals are unstable and readily revert to the parent aldehyde and alcohol in the presence of dilute acid. Thus, Statement II is True.
Step 3: Final Answer:
Both statements are true.
Statement I refers to the nucleophilic addition-elimination reaction of carbonyls with ammonia derivatives. Statement II refers to the instability of hemiacetals in acidic media.
Step 2: Detailed Explanation:
Statement I: Acetaldehyde ($CH_3CHO$) reacts with semicarbazide ($NH_2NHCONH_2$) to form a semicarbazone. The reaction is a condensation (loss of $H_2O$) and occurs optimally at pH 3.5. Thus, Statement I is True.
Statement II: The given molecule is a hemiacetal (formed from benzaldehyde and methanol). Hemiacetals are unstable and readily revert to the parent aldehyde and alcohol in the presence of dilute acid. Thus, Statement II is True.
Step 3: Final Answer:
Both statements are true.
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