The presence of both rings and pi bonds contribute to the index of hydrogen deficiency in a compound.

Name: The presence of both rings and pi bonds contribute to the index of hydrogen deficiency in a compound.
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The index of hydrogen deficiency (IHD), also known as the degree of unsaturation, indicates the total number of pi bonds and rings in a compound. Each ring or pi bond increases the IHD by one.

The Presence of Both Rings and Pi Bonds Contribute to the Index