Answer
The compound is an ether (general formula $ROR$).
Its name is $ethyl \ 2-methylbutyl\ ether$.
Work Step by Step
The compound has the general formula $ROR$. So, it is an ether.
Naming:
The first $-R$ group has 4 carbon atoms in its longest chain, and a methyl group at the position 2 (counting from the $-O$ atom). The other $-R$ group is $-ethyl$. Hence, name of the ether is $ethyl\ 2-methylbutyl\ ether$
