Question:
C$_2$H$_5$Cl + KCN $\rightarrow$ X (major product). X can also be obtained from which of the following reactions? I. C$_2$H$_5$NH$_2 \xrightarrow{KOH, CHCl_3, \Delta}$, II. C$_2$H$_5$CONH$_2 \xrightarrow{Py, \Delta}$, III. C$_2$H$_5$CHO (i)NH_2OH, (ii)(CH_3CO)_2O
C$_2$H$_5$Cl + KCN $\rightarrow$ X (major product). X can also be obtained from which of the following reactions? I. C$_2$H$_5$NH$_2 \xrightarrow{KOH, CHCl_3, \Delta}$, II. C$_2$H$_5$CONH$_2 \xrightarrow{Py, \Delta}$, III. C$_2$H$_5$CHO (i)NH_2OH, (ii)(CH_3CO)_2O
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Amides and oximes can be dehydrated to nitriles!
Updated On: Jun 6, 2026
- I, II only
- II, III only
- I, III only
- I, II, III
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Syntheses of alkyl cyanides (nitriles).
Step 2: Meaning
$C_2H_5Cl + KCN \rightarrow C_2H_5CN$ (X).
Step 3: Analysis
I is Carbylamine reaction (gives isocyanide $R-NC$). II is dehydration of amide (gives cyanide $R-CN$). III is dehydration of oxime (gives cyanide $R-CN$).
Step 4: Conclusion
II and III produce the same cyanide.
Final Answer: (B)
Syntheses of alkyl cyanides (nitriles).
Step 2: Meaning
$C_2H_5Cl + KCN \rightarrow C_2H_5CN$ (X).
Step 3: Analysis
I is Carbylamine reaction (gives isocyanide $R-NC$). II is dehydration of amide (gives cyanide $R-CN$). III is dehydration of oxime (gives cyanide $R-CN$).
Step 4: Conclusion
II and III produce the same cyanide.
Final Answer: (B)
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