- Phenol gives violet colour with neutral $\mathrm{FeCl}_3$ not ethanol.
- $1^{\circ}$ amine gives positive test with $\mathrm{CHCl}_3 / \mathrm{KOH}$ not $2^{\circ}$ amine.
- Aldehyde gives positive test with ammonical silver nitrate not ketone.
- Cinnamic acid gives bromine water test.
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