Hello mate,
I think if you are not understanding whole of morrison and
boyd then please instead of wasting further time just do
not refer this book anymore.
I already have said this several times to many goiitians on
this site that "morrison and boyd" is really very complex &
congested + Huge to understand.
I would suggest you to go for a better,easy to understand
book like :
"MTG - Interactive Organic chemistry".
I use this book and i feel that this book is really very easy
to understand as well as grasp the topics that can be very
tough to know.
Hope you find it useful.
Cheers !!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 
And no need to go back to 10th class books.