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Multiple Choice
What is the index of hydrogen deficiency (degree of unsaturation) for ?
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1
Identify the molecular formula given: C6H6.
Recall the formula for the index of hydrogen deficiency (IHD), also known as the degree of unsaturation:
\(IHD = \frac{2C + 2 - H}{2}\)
where \(C\) is the number of carbons and \(H\) is the number of hydrogens in the molecule.
Substitute the values from the molecular formula into the formula:
\(IHD = \frac{2 \times 6 + 2 - 6}{2}\)
Simplify the numerator first:
\(2 \times 6 = 12\), so the numerator becomes \$12 + 2 - 6$.
Calculate the final value of the numerator and then divide by 2 to find the IHD, which tells you the total number of rings and/or multiple bonds present in the molecule.