1. A Review of General Chemistry
Degrees of Unsaturation
Multiple Choice
Multiple Choice
What is the index of hydrogen deficiency (IHD) for the following molecule?
![The figure illustrates the structure of a molecule. A 5-carbon pentagonal ring is in a vertical orientation with C 1 occupying the topmost vertex. A double bond is present between C 2 and C 3 and C 4 and C 5. C 2 is single bonded to C 1 of a 2-carbon alkyne chain depicted as a line structure using three parallel lines. C 2 of the alkyne chain is single bonded on the upper right to C 2 of a 3-membered triangular ring in a horizontal orientation consisting of 1 O and 2 C atoms. O occupies the first position, which is the top right vertex.](https://media.pearsoncmg.com/ph/esm/ecs_mullins_organic1e/msa/content/practice-test/img/Ch08_Q01_QT.jpg)
A
6
B
4
C
7
D
5
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