Question:
What are X and Y respectively in the following sequence of reactions?
What are X and Y respectively in the following sequence of reactions?
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KCN gives alkyl cyanides (R–CN), while AgCN tends to give isocyanides (R–NC).
Updated On: Jun 9, 2026
- Option 1
- Option 2
- Option 3
- Option 4
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The Correct Option is C
Solution and Explanation
Concept:
Cyanide ion (\(CN^-\)) is ambidentate, but in nucleophilic substitution reactions with alkyl halides, it predominantly forms alkyl nitriles (\(R-CN\)).
Step 1: Formation of X.
Alkyl halide + KCN → substitution occurs via carbon end of cyanide: \[ R-X + KCN \rightarrow R-CN \] So, X = CN.
Step 2: Formation of Y.
Another nucleophilic substitution with KCN also gives nitrile due to same bonding preference. So, Y = CN.
Step 3: Conclusion.
Both products contain \(C \equiv N\) bond in nitrile form. \[ \boxed{CN, CN} \]
Step 1: Formation of X.
Alkyl halide + KCN → substitution occurs via carbon end of cyanide: \[ R-X + KCN \rightarrow R-CN \] So, X = CN.
Step 2: Formation of Y.
Another nucleophilic substitution with KCN also gives nitrile due to same bonding preference. So, Y = CN.
Step 3: Conclusion.
Both products contain \(C \equiv N\) bond in nitrile form. \[ \boxed{CN, CN} \]
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