organic chemistry means study of organisms and organic things? how does carbon and hydro carbons be organic
Since most of the living organism are formed of carbon and it's compound therefore their study was known as organic chemistry in early years of research on them. Since most of the organic compounds consist of Carbon and Hydrogen covalent bonds therefore organic chemistry is also known as study of carbon hydrogen compounds. But there are exception to this rule too when carbon and hydrogen are not covalently bonded to each other.
But it was until 1828 that study of organic matter and living beings was knows as organic chemistry .
In 1828 Woehler synthesized urea (organic compound) from inorganic compound and thus since then study of living being is specifically known as Biochemistry where organic chemistry may be considered as a part of it.