Question

question 17 of 49
propane is an alkane with the molecular formula c₃h₈.
a) draw the complete structure of propane. (draw all hydrogen atoms.)
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c h

Explanation:

Propane is an alkane, so all carbon-carbon bonds are single bonds, and each carbon has 4 total bonds to satisfy the octet rule. The 3 carbon atoms are connected in a chain, with the end carbons bonded to 3 hydrogen atoms each, and the central carbon bonded to 2 hydrogen atoms.

Answer:

The complete structure of propane is:
$$\ce{H - \underset{\underset{H}{|}}{C} - \underset{\underset{H}{|}}{C} - \underset{\underset{H}{|}}{C} - H}$$
$$\hspace{0.5em} \hspace{0.3em} H \hspace{1.2em} H \hspace{1.2em} H$$
$$\hspace{0.5em} \hspace{0.3em} | \hspace{1.4em} | \hspace{1.4em} |$$
$$\hspace{0.5em} \hspace{0.3em} H \hspace{1.2em} H \hspace{1.2em} H$$

In simplified bond-line form with all hydrogens shown: $\ce{CH3-CH2-CH3}$ (where each $\ce{CH3}$ has three $\ce{H}$ atoms attached to the $\ce{C}$, and $\ce{CH2}$ has two $\ce{H}$ atoms attached to the central $\ce{C}$)