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Which are incorrect?

And when can I use 'whose' instead of 'of which'?

1a. It was a war, which the effect of still continues.

1b. It was a war, the effect of which still continues.

1c. It was a war, whose effect still continues.

2a. I saw the collection of beer bottles, which I drank two of.

2b. I saw the collection of beer bottles, (only) two of which I drank.

2c. I saw the collection of beer bottles, whose (only) two I drank.

3a. I saw the collection of beer bottles, which two of were mine.

3b. I saw the collection of beer bottles, two of which were mine.

3c. I saw the collection of beer bottles, whose two were mine.

Thanks
Comments  
These are OK as amended:

1b. It was a war the effect of which still continues.
1c. It was a war whose effect still continues.
2b. I saw the collection of beer bottles, (only) two of which I drank.
3b. I saw the collection of beer bottles, two of which were mine.

Some people don't like 'whose' referring to non-humans, and they go to great lengths to avoid it. It doesn't bother me, but I usually bow to peer pressure.

Offhand, I cannot see the key to why 'whose' works in 1 but not in 2 or 2. Is it the linking verb? Maybe CJ will come along with the answer.
Thanks a lot.

Any reason why 2a is incorrect? I'm sure I've heard it, maybe read it...
Students: Are you brave enough to let our tutors analyse your pronunciation?
I don't think read it, unless it was representing speech. Yes, I've heard it. It sounds awkward because it is composed linearly, as is most spoken English. That's why I said earlier that it is a thankless task to try to punctuate it or worry about how to punctuate it accurately. Spoken English lacks such marks. If I were to try that one, I would fall back on the m-dash:

...bottles– which I...
Mister Micawber
Offhand, I cannot see the key to why 'whose' works in 1 but not in 2 or 2. Is it the linking verb? Maybe CJ will come along with the answer.

I guess it's because "of" in (2) and (3) does not have the correct sense of possession (broadly speaking) that "whose" requires?
Mr WordyI guess it's because "of" in (2) and (3) does not have the correct sense of possession (broadly speaking) that "whose" requires?

Ah, yes, that makes sense. Well spotted.
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Good idea, MrW.