Provide the IUPAC names for the following organic structures: CH3-CH2-COOH, I-CH2-COOH, Br-CH(Cl)-COOH, HOOC-CH2-CH(COOH)-COOH, Br-COOH.

Here are the names for the given organic structures:

1. Structure 1: This compound has a three-carbon chain with a carboxylic acid group.

   $$\text{CH}_3-\text{CH}_2-\text{COOH}$$

   Name: Propanoic acid

2. Structure 2: This compound has a two-carbon chain with a carboxylic acid group and an iodine atom on the alpha-carbon.

   $$\text{I}-\text{CH}_2-\text{COOH}$$

   Name: 2-Iodoethanoic acid

3. Structure 3: This compound has a two-carbon chain with a carboxylic acid group, and both a bromine and a chlorine atom on the alpha-carbon.

   $$\text{Br}-\text{CH}(\text{Cl})-\text{COOH}$$

   Name: 2-Bromo-2-chloroethanoic acid

4. Structure 4: This compound is a three-carbon chain with a carboxylic acid group on each carbon.

   $$\text{HOOC}-\text{CH}_2-\text{CH}(\text{COOH})-\text{COOH}$$

   Name: Propane-1,2,3-tricarboxylic acid

5. Structure 5: This compound is a one-carbon carboxylic acid with a bromine atom attached to the carbonyl carbon.

   $$\text{Br}-\text{COOH}$$

   Name: Bromoformic acid