Match the reagents in List - I with products obtained from their carbonyl compounds in List - II.
Codes:
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Create a mental map or a quick reference sheet for the reactions of carbonyl compounds with nitrogen nucleophiles (ammonia derivatives), alcohols, and HCN. Recognizing the reagent-product pair is a key skill for organic chemistry questions.
Step 1: Understanding the Question:
The question requires matching carbonyl reaction reagents (List-I) with their corresponding products (List-II). These are standard named reactions of aldehydes and ketones. Step 2: Matching each reagent with its product: (a) NH\(_2\)OH (Hydroxylamine): Carbonyl compounds (aldehydes and ketones) react with hydroxylamine in a condensation reaction to form oximes.
\[ \text{>C=O} + \text{H}_2\text{N-OH} \rightarrow \text{>C=N-OH} + \text{H}_2\text{O} \]
So, a \(\rightarrow\) ii. (b) R-NH\(_2\) (Primary Amine): Carbonyl compounds react with primary amines to form imines, which are also known as Schiff bases.
\[ \text{>C=O} + \text{H}_2\text{N-R} \rightarrow \text{>C=N-R} + \text{H}_2\text{O} \]
So, b \(\rightarrow\) iii. (c) R-OH (Alcohol): In the presence of an acid catalyst, aldehydes react with two equivalents of alcohol to form acetals. Ketones form ketals.
\[ \text{R'-CHO} + 2\text{R-OH} \xrightarrow{\text{H}^+} \text{R'-CH(OR)}_2 + \text{H}_2\text{O} \]
So, c \(\rightarrow\) iv. (d) H-C\(\equiv\)N (Hydrogen Cyanide): Hydrogen cyanide adds across the carbonyl double bond of aldehydes and ketones in a nucleophilic addition reaction to form cyanohydrins.
\[ \text{>C=O} + \text{HCN} \rightarrow \text{>C(OH)(CN)} \]
So, d \(\rightarrow\) i. Step 3: Compiling the final match:
The correct matches are:
- (a) maps to (ii)
- (b) maps to (iii)
- (c) maps to (iv)
- (d) maps to (i)
This corresponds to the code: a – ii, b – iii, c – iv, d – i. Step 4: Final Answer:
The correct code is (A).
