Textbook Question
For each of the following molecular formulas, determine the number of elements of unsaturation, and draw three examples.
d. C5H5NO2
e. C6H3NClBr
1. A Review of General Chemistry
Degrees of Unsaturation
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What is the index of hydrogen deficiency (IHD) for the following molecule?
A
6
B
4
C
7
D
5
Verified step by step guidance1
Identify the molecular formula of the compound. The structure shows a benzene ring, a triple bond, and an epoxide. Count the number of carbon (C), hydrogen (H), and oxygen (O) atoms.
Calculate the IHD using the formula: IHD = (2C + 2 + N - H - X) / 2, where C is the number of carbons, N is the number of nitrogens, H is the number of hydrogens, and X is the number of halogens. Oxygen does not affect the IHD calculation.
Count the number of rings and multiple bonds in the structure. Each ring and each multiple bond (double or triple) contributes to the IHD.
Consider the benzene ring as contributing 4 to the IHD (3 double bonds and 1 ring).
Add the contribution from the triple bond, which is 2, to the IHD. Sum all contributions to find the total IHD.
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