Answer: C (9). The formula \(\text{CH}_2\text{CHCH}_3\) is propene, \(\text{CH}_2=\text{CH-CH}_3\). Count every covalent bond, remembering that a C=C double bond is two covalent bonds.
\(\text{CH}_2=\) end: 2 C-H bonds. The C=C double bond: 2 bonds. The middle \(=\text{CH-}\): 1 C-H bond. The C-C single bond to the methyl group: 1 bond. The \(\text{CH}_3\) group: 3 C-H bonds.
Total = \(2 + 2 + 1 + 1 + 3 = 9\) covalent bonds. Answer C.
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