Each flip has two possible outcomes and they are independent events, so there are 24 = 16 possible results.
Of these, only 2 (HHHH, TTTT) are the same 4 each time, Thus:
probability = 2/16 = 1/8
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Assuming the coin is fair, it is (1/2)5 = 1/32.
As a coin has two sides, the odds are always 50-50.
None, since that would imply that in 18 cases the coin did not show heads or tails!
For a normal coin, it is 0.5.