AP EAMCET · Chemistry · Amines

What are \(X\) and \(Y\) in the following reactions?
\(X \underset{\text { (ii) } \mathrm{H}_2 \mathrm{O}}{\stackrel{\text { (i) } \mathrm{LiAlH}_4}{\longrightarrow}} R \mathrm{CH}_2 \mathrm{NH}_2 \stackrel{\mathrm{H}_2 / \mathrm{Ni}}{\longleftarrow} Y\)

A \(R \mathrm{CO} \stackrel{\ominus}{\mathrm{O}} \stackrel{\oplus}{\mathrm{N}} \mathrm{H}_4 \quad R \mathrm{CH}_2 \mathrm{CN}\)
B \(R \mathrm{CN} \quad R \mathrm{CONH}_2\)
C \(\mathrm{RNHCH}_3 \quad R \mathrm{CH}_2 \mathrm{NC}\)
D \(R \mathrm{CONH}_2 \quad R \mathrm{CN}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(R \mathrm{CONH}_2 \quad R \mathrm{CN}\)

Step-by-step Solution

Detailed explanation

In the given reaction \(X\) is \(\mathrm{RCONH}_2\) and \(Y\) is \(R \mathrm{CN}\) \(\mathrm{LiAlH}_4\) is a nucleophilic reducing agent used to reduce polar multiple bonds like \(>\mathrm{CH}=\mathrm{O}\). It reduces amides and nitrites to amines while catalyst like Ni gives…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

List-I (Molecule)	\(\text{List-II (Dipole moment in D)}\)
A) \(\mathrm{HCl}\)	I) \(1.07\)
B) \(\mathrm{NH}_3\)	II) \(1.85\)
C) \(\mathrm{H}_2\mathrm{O}\)	III) \(0.23\)
D) \(\mathrm{NF}_3\)	IV) \(1.47\)

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What are \(X\) and \(Y\) in the following reactions?\(X \underset{\text { (ii) } \mathrm{H}_2 \mathrm{O}}{\stackrel{\text { (i) } \mathrm{LiAlH}_4}{\longrightarrow}} R \mathrm{CH}_2 \mathrm{NH}_2 \stackrel{\mathrm{H}_2 / \mathrm{Ni}}{\longleftarrow} Y\)

Step-by-step Solution

What are \(X\) and \(Y\) in the following reactions?
\(X \underset{\text { (ii) } \mathrm{H}_2 \mathrm{O}}{\stackrel{\text { (i) } \mathrm{LiAlH}_4}{\longrightarrow}} R \mathrm{CH}_2 \mathrm{NH}_2 \stackrel{\mathrm{H}_2 / \mathrm{Ni}}{\longleftarrow} Y\)