Question

What property enables you to classify an alcohol as primary, secondary, or tertiary?

What do all compounds classified as aromatic compounds have in common and why are they called aromatic?

Answer 1

TO understand how to classify the primary, secondary and tertiary alcohol, 1st we need to understand the meaning of primary, secondary and tertiary carbon.

--> Primary carbons are carbons attached to one other carbon.
--> Secondary carbons are attached to two other carbons.
--> Tertiary carbons are attached to three other carbons.

Primary alcohol is alcohol in which -OH is attached to primary carbon
Secondary alcohol is alcohol in which -OH is attached to Secondary carbon
Tertiary alcohol is alcohol in which -OH is attached to Tertiary carbon

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For a compound to be aromatic, all of the below conditions must be satisfied

-->The molecule must be cyclic (a ring of atoms)
-->The molecule must be planar (all atoms in the molecule lie in the same plane)
-->The molecule must be fully conjugated (p orbitals at every atom in the ring)
-->The molecule must follow Huckel rule that is it must 4n+2π pi electrons in conjugation (n=0 or any positive integer)

They were called aromatic initially because of their fragrance bot nowadays aromaticity refers to stability of the compound