What Is the Index of Hydrogen Deficiency (Or Degree of Unsaturation)of

question 29

Multiple Choice

What is the index of hydrogen deficiency (or degree of unsaturation) of the following molecule?

• A)2
• B)3
• C)4
• D)5

---

Definitions:

Secondary Amide

An amide derived from an acid by replacement of the hydroxyl group by an amino group, where the nitrogen atom is bonded to two carbon atoms.

Primary Amide

Organic compounds containing the functional group -CONH2 attached to a primary alkyl or aryl group.

γ-Butyrolactam

A cyclic amide consisting of a four-carbon ring, used in organic synthesis and pharmaceuticals.

(R)-4-Ethoxypentanenitrile

An enantiomer of a nitrile compound characterized by the presence of an ethoxy group (-OC2H5) on the fourth carbon of a pentane chain.