Answer
The substitution product is $CH_3(CH_2)_4CH_2-OCH_2CH_3$
Work Step by Step
When 1-bromohexane ( $CH_3(CH_2)_4CH_2Br$ ) reacts with $NaOCH_2CH_3$, the $-Br$ is substituted with $-OCH_2CH_3$. The substitution product is $CH_3(CH_2)_4CH_2-OCH_2CH_3$