Step 1: Concept
The chemical 2-(phenylethyl) hydrazine, commonly known as Phenelzine, belongs to the hydrazine class of antidepressants.
Step 2: Meaning
Hydrazine antidepressants work by inhibiting enzymes responsible for the breakdown of neurotransmitters in the brain.
Step 3: Analysis
Phenelzine is a non-selective and irreversible inhibitor of the enzyme Monoamine Oxidase (MAO). By inhibiting this enzyme, it increases the levels of norepinephrine, serotonin, and dopamine.
Step 4: Conclusion
Therefore, 2-(phenylethyl) hydrazine sulfate possesses monoamino oxidase inhibitor (MAOI) properties.
Final Answer: (A)