The theoretical probability of getting tails is 1/2 no matter how many times you flip it.
a)No it wouldn't because theoretical probability is based on the total number of outcomes and the likeliness of each but if you flip a coin it can land any way which means its very much possible to get tails on every single flip no matter how slim the odds are.
b)theoretical is based on facts and experimental is when you test it out yourself
c)yes it is because the theoretical probability is not always correct but usually the more times you flip it the closer the experimental probability gets to the theoretical probability.
Hope that helps! :)