A straight-chain carbon compound constructed from must contain at least one carbon-carbon double bond.

6 hydrogen, three carbon (CH2=CH-CH3)

Explanation:

Carbon atoms can bond to four other atoms

   CH2=CH-CH3

First carbon is bonded to C(double) and 2H = 4 bonds

Second carbon is bonded to C(double), C (single) and one H = 4 bonds

Third carbon is bonded to one carbon(single) and three H= 4 bonds

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