Question:
Which of the following processes does not yield a primary amine?
Which of the following processes does not yield a primary amine?
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Hydrazine reactions form hydrazones, not amines.
Updated On: Apr 23, 2026
- CH$_3$COCH$_3$ + NH$_3$ + H$_2$ $\xrightarrow{Ni}$
- CH$_3$CH$_2$CN + H$_2$ $\xrightarrow{Ni,140^\circ C}$
- CH$_3$CHO + H$_2$NOH $\xrightarrow{Na, C_2H_5OH}$
- CH$_3$CHO + N$_2$H$_4$ $\xrightarrow{NaBH_4}$
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The Correct Option is D
Solution and Explanation
Concept:
Primary amines are formed by reduction of nitriles, oximes, or by reductive amination. Some reactions form derivatives instead.
Step 1: Analyze option (A): Reductive amination gives primary amine.
Step 2: Option (B): Nitrile reduction gives primary amine (R–CH$_2$NH$_2$).
Step 3: Option (C): Oxime reduction also gives primary amine.
Step 4: Option (D): Hydrazine forms hydrazone, not a primary amine.
\[ RCHO + N_2H_4 \rightarrow RCH=N–NH_2 \] Conclusion:
Thus, option (D) does not yield a primary amine.
Step 1: Analyze option (A): Reductive amination gives primary amine.
Step 2: Option (B): Nitrile reduction gives primary amine (R–CH$_2$NH$_2$).
Step 3: Option (C): Oxime reduction also gives primary amine.
Step 4: Option (D): Hydrazine forms hydrazone, not a primary amine.
\[ RCHO + N_2H_4 \rightarrow RCH=N–NH_2 \] Conclusion:
Thus, option (D) does not yield a primary amine.
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