Naming compounds with more than one functional group
The priority of the functional groups are listed below from highest to lowest priority carboxyl groups been the highest in priority.
Carboxylic acids
Amides
Aldehydes
Ketones
Alcohols
Amines
Ethers
Alkenes
Alkynes

Now let's first of all look at amines and alcohols.
Alcohols have the hydroxy (OH) functional group while amines have the amino (NH2) functional group. The question here is when should you use the terms hydroxy or amino instead of alcohol and amine.
Simple. If the hydroxy functional group is the priority then the molecule is an alcohol and has a suffix of ol, but if its not the priority it has the prefix of hydroxy. If the amino functional group is the priority then we use the suffix amine, however, if it is not a priority we use the prefix amino.

 

Here is an example.
Consider the molecule on the right. The carboxyl functional group is the priority. The molecule is clearly an acid where the carbon backbone is butanoic acid. Coming off the third carbon is a hydroxyl group. So the name of this molecule has the prefix hydroxy and is given the name 3-hydroxybutanoic acid.
In a molecule where the hydroxyl group is a priority the suffix ol is used.
So the name of this molecule is butan-2-ol
Consider the molecule shown on the right. Since the amino functional group is the priority then we use the suffix amine to derive the name propan-1-amine.
Now looking at the molecule on the right we can see that the amino functional is clearly not the priority, so we use the prefix amino to derive the name 2-aminopropanoic acid.

Lets see how this is applied.

Consider the compound shown on the right.
it consists of two functional groups, hydroxy and a carboxyl group. Is it an alcohol or is it an acid? According to the priority list the root name is a carboxylic acid.

So it is propanoic acid with a hydroxy group on carbon number two.
So it is 2-hydroxypropanoic acid.

Consider the compound shown on the right.
It consists of two functional groups, carboxyl and a double C=C bond.

According to the priority the root chain of carbons must include the carboxyl group. So it is a carboxylic acid with a double bond on carbon number three.

*** Note that since the parent molecule is an acid and not an alkene the last "e" in the ene is removed.
The compound is 3-butenoic acid or but-3-enoic acid

Consider the compound shown on the right.
It consists of three functional groups, carboxyl, hydroxy and chloro.

According to the priority the root chain of carbons must include the carboxyl group. So it is a carboxylic acid with a hydroxy group on carbon number 2 and a chloro on carbon number 3.
The compound is 3-chloro-2-hydroxybutanoic acid

Consider the compound shown on the right.
It consists of two functional groups, hydroxy and an amino. According to the priority it is an alcohol with an amino group on carbon number 3.

The compound is 1-amino-2-propanol

Consider the compound shown on the right.
It consists of two functional groups, carboxyl and an amino. According to the priority it is a carboxylic acid with an amino group on carbon number 3.

The compound is 3-aminobutanoic acid

Consider the compound shown on the right.
It consists of three functional groups, a carbon to carbon double bond a chloro and a hydroxy. According to the priority it is an alcohol with a chloro group on carbon number 3 and a double bond on carbon number 2.

The compound is 3-chloro-2-buten-1-ol or 3-chlorobut-2-en-1-ol.

Notice how the last e in butene is removed and the suffix -1-ol added.

Consider the compound shown on the right.
It consists of three functional groups, a carbon to carbon double bond a chloro and a methyl. According to the priority it is an alkene with a chloro group on carbon number 1 and a methyl group on carbon number 2.

The compound is 1-chloro-2-methyl-2-butene

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