Given below are two statements:
Statement I: Cross aldol condensation between two different aldehydes will always produce four different products.
Statement II: When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum , it forms a condensation product with acetophenone only.
Statement I is false but Statement II is true
Both Statement I and Statement II are false
Statement I is true but Statement II is false
Both Statement I and Statement II are true
Correct answer:C
Standard Method
Given: Two statements about cross aldol condensation and the reaction of semicarbazide with benzaldehyde and acetophenone.
Find: Which option correctly identifies the truth values of Statement I and Statement II.
Step 1: Analysis of Statement I. Cross aldol condensation between two aldehydes having -hydrogens can form four products due to self and cross reactions. Therefore, Statement I is true.
Step 2: Analysis of Statement II. Semicarbazide reacts with both aldehydes and ketones. Benzaldehyde reacts faster than acetophenone due to less steric hindrance. Therefore, Statement II is false.
Step 3: Conclusion. Statement I is true, but Statement II is false. The correct option is C.
Assuming that semicarbazide reacts only with ketones is incorrect because it forms condensation products with both aldehydes and ketones. Compare their reactivity before deciding which compound reacts preferentially.
Treating the word "always" in Statement I casually can lead to error. In the context used in the solution, the count comes from self and cross aldol possibilities, so all reaction pathways must be considered before judging the statement.
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