I love organic chemistry classes.

Tropylium is one of the important cations in organic chemistry.

A cation is a type of positive ion, which is an atom or molecule that has lost electrons.

He ate one apple.

Health is very important.

His opinion is very important.

This is an organic vegetable.

He is majoring in chemistry at university.

He is an expert in chemistry.

Organic solvents play an important role in chemical reactions.