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a) Dipropyl ether

This name suggests that we have an ether.

That ether has two alkyl chains - two propyl groups.

Those side chains are drawn as in the picture. Three carbon atoms are connected with single bonds, and H atoms have been assigned to them.

b) 2, 2-dimethyl-3-hexanol.

This compound is an alcohol-alcohol that has an OH group at carbon 2.

The parent chain has 6 carbon atoms visible from the "Hexa" in the name.

It also has 2 methyl groups on carbon 2.

At the end, you assign H atoms to each carbon atom that's missing them

c) 2 -ethoxy butane

This type of naming of the compound is different than what we have shown so far, but it's also an ether.

The ethoxy group is composed of an oxygen atom and an ethyl group, and OCH₂CH₃ is attached to another chain.

In this case, it's a butane chain at carbon 2.