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Between is a preposition, and all prepositions take the objective case after them.
We use the double genitive (of + name + 's, his, mine etc) when we want to emphasise the person who possesses rather than the thing which he possesses. A friend of his is simply another way of saying one of his friends.
The cinema appeals to me is correct, and means I like the cinema very much.
The meaning of the first sentence is that you don't like the two colours together. The intended meaning is that you don't like either of them, even separately.
If we join clauses with different subjects, we use and even after a negative: He didn't write to me and I was worried.
We rarely use whom in modern English. We still use it after prepositions to, by, with, after, on etc. For example, The girl to whom you were speaking is Nigerian. We prefer to avoid this nowadays by changing the order of the sentence: The girl you were speaking to is Nigerian. You can also use that in
place of who: The girl that you were speaking to is Nigerian.