Four letter puzzles on US states

Question

Here are four questions on the letters in the names of US states and US state capitals:

1. What is the only US state that has no letter in common with it's capital city?
2. What is the only US state capital that doesn't contain a letter from the word MACKEREL?
3. What is the only US state that doesn't contain a letter from the word MACKEREL?
4. What is the only US state that doesn't contain a letter from the word COMMUNIST?

Answer 1

Just had to look at a list of states and capitals to figure this out.

1. South Dakota
2. Boston
3. Ohio
4. Delaware