Alcohols and carboxylic acids test questions

1

What is the name of this carboxylic acid?

C atom bonded to 3 H atoms is joined to C with 2 H, joined to third C atom. This C joined to hydroxyl group and double-bonded to an O atom.

2

Which of the following is not a use of alcohols?

3

Which of these molecules is an isomer of butan-2-ol?

4

Which of the following molecules contain a carboxyl group?

5

Ethanol can be dehydrated using a catalyst. Which of the following could be produced during this reaction?