Question

How many sp2-hybridized carbons are in the structure of norethindrone?

Answer 1

There are three `sp^2` hybridized carbons in the structure of norethindrone.

Explanation:

The structure if norethindrone is

(from dailymed.nlm.nih.gov)

Every carbon that is part of a double bond system is `sp^2` hybridized.

We see that there are only three such carbon atoms, and they are all in the lower left hand ring.

Two of them are the atoms in the `"C=C"` double bond.

The third is the `"C"` atom in the `"C=O"` double bond.