in-the-naming-of-substituents-in-unsaturated-heterocycles-which-rule-must-be-app

Question

In the naming of substituents in unsaturated heterocycles, which rule must be applied regarding heteroatoms?

Accepted Answer

Heteroatoms receive the lowest possible numbers.

Answer

Heteroatoms receive the highest possible numbers.

Answer

Only carbon atoms are assigned location numbers.

Answer

Heteroatoms are not considered in numbering.