KCET · Chemistry · Haloalkanes and Haloarenes

Identify the products \(A\) and \(B\) in the reactions :
\[
\begin{aligned}
& R-X+\mathrm{AgCN} \longrightarrow A+\mathrm{Ag} X \\
& R-X+\mathrm{KCN} \longrightarrow B+\mathrm{KX}
\end{aligned}
\]

A \(A=R C \mathrm{~N} ; B=R \mathrm{NC}\)
B \(A=R \mathrm{NC} ; B=R C N\)
C \(A=R \mathrm{NC} ; B=R \mathrm{NC}\)
D \(A=R-\mathrm{CN}: B=R \mathrm{CN}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(A=R \mathrm{NC} ; B=R C N\)

Step-by-step Solution

Detailed explanation

\(R-X+\mathrm{AgCN} \longrightarrow R \mathrm{NC}+\mathrm{Ag} X\)
\[
R-X+\mathrm{KCN} \longrightarrow R \mathrm{CN}+\mathrm{KX}
\]
\(\mathrm{KCN}\) is predominantly ionic in nature, its \(\mathrm{C}-\). . bond is more stable than \(\mathrm{C}-\mathrm{N}\) bond. \(T^{\prime}\) :. refore, in this case attack takes place through carbon atom. On other hand, \(\mathrm{AgCN}\) is predominantly covalent in nature, hence only nitrogen is available for bonding result in formation of \(R \mathrm{NC}\).

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	List-II
(a)	\(\text{NH}_2\text{OH}\)	(i)	Cyanohydrin
(b)	\(R-\text{NH}_2\)	(ii)	Oxime
(c)	\(R-\text{OH}\)	(iii)	Schiff base
(d)	\(H-C \equiv N\)	(iv)	Acetal

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Identify the products \(A\) and \(B\) in the reactions :\[\begin{aligned}& R-X+\mathrm{AgCN} \longrightarrow A+\mathrm{Ag} X \\& R-X+\mathrm{KCN} \longrightarrow B+\mathrm{KX}\end{aligned}\]

Step-by-step Solution

Identify the products \(A\) and \(B\) in the reactions :
\[
\begin{aligned}
& R-X+\mathrm{AgCN} \longrightarrow A+\mathrm{Ag} X \\
& R-X+\mathrm{KCN} \longrightarrow B+\mathrm{KX}
\end{aligned}
\]