Attempted the first one and got:
-bigger distance between the layers, so they can be easier separated;
-the carbon atoms attached to oxygens are more reactive that the regular atoms in graphite and they can easier undergo reactions during the synthesis of graphene.
-you have to remove oxygen.
2. x=0.375, xmax=0.5;
3. -OH, -COOH, -C=C-, -C-O-C-
4. should I count from the picture or what ?
What do you think, is anything correct? Anyone has an idea about 4?