What are the seven isomers of C4H10O?
We know from the formula that these isomers contain no rings or double bonds.
The isomers must be alcohols and ethers.
Let's start by drawing the alcohols.
Start with four carbons in a row and put an
This gives us
Now use a 3-carbon chain with a
Now for the ethers.
Let's start with five atoms in a row.
Finally, the only choice for a branched-chain ether is
And there are your seven isomers of