Chem topic 17 question helpWatch
b) C as this shows cis-trans. This can be hard to explain over this but essentially the H group can be on the same side or the opposite side. This is hard to explain so here's the link https://www.chemguide.co.uk/basicorg...geometric.html
c) this wasn't learnt on my exam board sorry
d) C only primary and secondary alcohols are oxidised into carboxylic acid which both X and Y show
Before I help you anymore I would recommend going on chemguide and reading about optical isomerism as it seems like that's the questions you're struggling with. My tip is drawing them out from their molecular formula to their structural. Also look up Allery Chemistry on YouTube to look at it visually!