Can hydrogen be on the same side of the carbons in a double carbon-carbon bond?

Question

Can it be on the same side? Can it be on a different side?

Answer 1

In double bonds (or alkene compounds) you can have either cis or trans formations, Depending what groups is on the other carbon in the double is hydrogen can be on the same side. It however can't be on the same as as one of the carbons in the double bond.

Answer 2

Not certain I get the gist of this question, but the answer is yes as it is posed.

The simplest, ethene, CH2=CH2, has H on same and diff sides.

If you mean cis/trans isomers,  the answer is no/yes.  Replacing one H on first C with a Cl and one on second C with Br, gives CHCl=CHBr. Cannot draw 3D structures here, but if both H's are 'above' the C's this is the cis isomer, if one is 'above' and one 'below' this is the trans isomer.

But if both H's are on same C...CClBr=CH2...there can be no cis/trans because you have only one asymmetrical C.

Is this what you wanted?  If not, give more detail and I'll try again  :-))