No, unlike can only be used as an adjective. It can only be an adjective because it must always be preceded by a linking verb (is, am, are, was, were, seems, etc.). A linking verb must connect (or...
No, some compound prepositions are idiomatic, in the English language. An example of this would be "according to".
no it is followed by a noun or a pronoun.
TO and FOR express the order. TO goes before a verb, and FOR before a noun.
because it is a preposition