Question

Consider the reactions :- Identify $A, X, Y$ and $Z$

• A. A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide
• B. A - Ethanal , X - Ethanol , Y - But - 2 - enal , Z - Semicarbazone
• C. A- Ethanol, X- Acet aldehyde, Y- Butanone, Z- Hydrazone
• D. A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine

Answer 1

The Correct Option is B

Let's analyze and identify the compounds \(A, X, Y,\) and \(Z\) in the given reactions. 

In organic chemistry, it is common to come across transformations where an aldehyde or ketone (carbonyl compound) is coupled with various reagents to form new products.

1. Substance \(A\): The correct identification should be a simple aldehyde. Based on the options and usual practice, \(A\) is Ethanal (Acetaldehyde), \(CH_3CHO\). Aldehydes are often used to react with alcohols or other reagents.
2. Substance \(X\): This is the alcohol form used in many organic reactions. The most common is Ethanol, \(C_2H_5OH\), which can be oxidized to form an aldehyde such as Ethanal.
3. Substance \(Y\): Given the reactivity of aldehydes, \(Y\) becomes But-2-enal, an enal formed via reactions involving aldehyde condensation, such as the Aldol condensation.
4. Substance \(Z\): When aldehydes react with reagents like semicarbazide, they form semicarbazones, which are derivatives of aldehydes or ketones where the aldehyde hydrogen or the ketone carbonyl oxygen is replaced by an azine group. Therefore, \(Z\) is Semicarbazone.

Hence, the correct identification based on the reaction understanding is:

A - Ethanal, X - Ethanol, Y - But-2-enal, Z - Semicarbazone.