Question

Piperidine will give azo dye test.

Answer 1

Hint: Write down the expanded structure of the organic compound piperidine. Now identify the functional group present. Azo dye test also called coupling reaction is used to identify the presence of primary aromatic amines. So, check if piperidine is aromatic and has a primary amine functional group.

Complete step-by-step answer:
Piperidine is an organic compound with the molecular formula ${\text{(C}{\text{H}}_2)}_5\text{NH}$. It is a heterocyclic amine consisting of a six membered ring with 5 methylene bridge groups and one amine group. It exists as a colourless liquid and has characteristic odour of amines.
Piperidine is derived from the Latin word Piper, which means pepper.
We will now draw the expanded structure of piperidine.

The above compound consists of a secondary amine i.e. two carbon atoms attached to the nitrogen atom.
Azo dye test is answered by primary amine only. This is because the coupling reaction takes place when two hydrogen atoms are attached to a nitrogen atom i.e. primary amine group.


Therefore, piperidine does not give the azo dye test and the correct answer is option (B).

Note: Piperidine and its derivatives are ubiquitous blocks or components of pharmaceutical chemicals. Piperidine structure is commonly found in :
- Icaridin which is a insect repellent
- Selective serotonin reuptake inhibitors
- Stimulants and nootropics like methylphenidate, ethylphenidate, pipradrol etc
- Selective estrogen receptor modulators
- Vasodilators
- Antipsychotic medications
- Opioids
- Arylcyclohexylamines
Along with this piperidine is used in chemical degradation reactions such as in the sequencing of DNA in the opening(cleavage) of modified nucleotides.