Question

multiple choice 2 points
if a certain hydrocarbon molecule has 10 carbons atoms, one ring and two triple bonds, how many hydrogens does it have?
12
18
10
16
14
previous

Explanation:

Step1: Calculate the degree of unsaturation

Degree of unsaturation formula: \( \text{Degree of unsaturation}=\text{Number of rings}+\text{Number of }\pi\text{ bonds}\). Here, number of rings = 1, number of triple bonds (each triple bond has 2 \(\pi\) bonds) = 2. So degree of unsaturation \(=1 + 2\times2=5\).

Step2: Use the formula for hydrogen count in hydrocarbons

The formula for the number of hydrogen atoms (\(H\)) in a hydrocarbon with \(n\) carbon atoms is \(H = 2n+ 2-2\times\text{Degree of unsaturation}\). Given \(n = 10\), then \(H=2\times10 + 2-2\times5\).

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Answer:

12