2.

Q: Could a transaction requesting locks from only one site cause distributed
deadlock when Chandy-Misra-Haas algorithm is used ? (Of course, other
transactions might already exist.) Can Chandy-Mistra-Haas algorithm discover
this deadlock ?

A: Suppose that the transaction requesting resources form only one site is Ti
and there is some other transaction Tj that can request some resources Ti is 
holding, then it is possible that Ti is part of a global deadlock. 

See, for example exercise 4. Transaction T0 requests resources only from one
site, S1, other transactions request resources from their "own" site and some
other site. CMH-algorithm can detect this deadlock as seen in exercise 4.