AS Chemistry past paper help needed

QP
http://www.ocr.org.uk/Images/131292-question-paper-unit-f332-chemistry-of-natural-resources.pdf
MS
http://www.ocr.org.uk/Images/135168-mark-scheme-unit-f332-chemistry-of-natural-resources-june.pdf

On 1b I can't understand how there are 22 hydrogens in the molecule, but I do undestand how there are 15 carbon. I've counted like 4 times . I get 26 hydrogens

On 1cii I can't understand how you know that exactly 2 molecules of Br₂ react. Since there is just one C=C bond in the molecule, surely just one Br₂ molecule reacts.

Thank you so much!

Maybe the attached images could help you visualize the reason why you have to get those two answers.

This is what I always draw in my exams :P
The purple lines represent "H-" bond.

Maybe the attached images could help you visualize the reason why you have to get those two answers.

This is what I always draw in my exams :P
The purple lines represent "H-" bond.

Make sure that for each C atom, there are 4 bonds attached to it. You may be adding too many Hydrogens to some C atoms. Especially the ones with the double bonds in the 1st example - they wouldn't have any H atoms attached to them.

For the c)ii) just remember - when the Bromine is added, the C=C opens up to form single bonds with a Br atom. So since there's 2 C=C bonds in rotundone, then that's 4 single bonds that can be formed. Therefore, it's 2 $Br_{2}$!