[AWK]

You can see everything in your sketches. Can you convert your sawhorse projections to Newman projection or directly draw anti- or syn-addition mechanism from Newman projection for butene or crotonic acid? Give it a try.
In addition, distinguish between symmetrical and unsymmetrical alkene, and cis- and trans-.

[sharbeldam]

please tell me this is right so i can sleep

[AWK]

Now, if R₁=R₂≠H and such conformations are possible that in some Newman projection all identical substituents lie exactly above each other (as in the last equation (cis-syn) or in the first equation (trans-anti) after a half-molecule rotation by 180°) Meso compounds are formed.
Without asymmetric induction, in the second and third reactions, always racemates are formed.

[sharbeldam]

Thank you so much AWK!! can you just confirm that in my last picture all the groups are correctly placed so i can make this video to help others as well ?

[AWK]

If there were mistakes, I would discuss them.

[sharbeldam]

<3 I want you to know that i appreciate that, and you helping me, will indirectly help many others, thanks again