[checounce]

Attached is a problem that I am not sure how to do. Can someone please point me in the right direction?
The question is:
Which would be the major product of the following reaction?

[checounce]

I am between 2 and 3. I think it may be 3? We just covered this today and my professor rushed through it and this question is due tonight by 11 pm.

[camptzak]

hope this isnt to late, the answer is actually 1. The deuterium atoms are added to the same side o the double bond. I think this is called "syn addition"

i they are added to the same side then they must be cis to one another, so the answer has to be 1

also, i think 2 and 3 are the same molecule

[Altered State]

I also think it's I, check out the mechanism for metal-catalytic hydrogenation:

http://i.imgur.com/yGzM1XE.jpg

Both hydrogen (Deuterium in this case, it's the same), added to the same side of the double bond.

[TwistedConf]

I am between 2 and 3.

2 and 3 are the exact same compound, and the wrong answer.