Chemistry - Nomenclature Question with Solution | TestHub

Compounds having the same molecular formula can exist as different isomers.
Since all the given compounds have the same molecular formula, statement (A) is correct.
Degree of unsaturation (DU) depends only on molecular formula, so all compounds have the same DU; hence (B) is also correct.
A compound may be cyclic and saturated or may contain double/triple bonds and be unsaturated, yet both can have the same DU. Therefore statement (D) is correct.
Hence, it is incorrect to say that all compounds are unsaturated.