Answer
The structure is:
$CH_3-CH_2-CH_2-CH_2-O-CH_2-CH_2-CH_2-CH_3$
Work Step by Step
In dibutyl ether, the two R groups are butyl (4 carbons). Hence, its structure is:
$CH_3-CH_2-CH_2-CH_2-O-CH_2-CH_2-CH_2-CH_3$
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