Aoa. I have just completed my MS in physical chemistry. I am going to opt it as optional subject too. kindly some one guide me is it a good option or not? as far as my academic record is concerned, I am good in all branches except Organic chemistry. I just hate mechanisms and conversions etc.
Secondly kindly mention scoring trend in chemistry too.

Chemistry is a scoring subject if you have prepared yourself pretty well in Physical, Inorganic and Organic chemistry especially paper one check your physical and inorganic skills while paper two is about organic chemistry. Problem lies in syllabus of chemistry because of its extensive nature e.g. there is one chapter comprising of chemistry of Carbon, Nitrogen,Oxygen and halogen family means FPSC has summed up four chapters in one chapter and in the same way quantum mechanics spans about particle in one dimension , three dimension etc. well I still planned to go with chemistry in 2014 and found that date sheet for me was the most hectic. Lot of syllabus and consecutive papers are the real exams of nerve and may be somewhere there i could not manage my composure, collapsed and scored 40 in paper 1 nd 75 in paper 2. well that's my story

You should unless you have other alternative optional in grip, since you are MS in it. Just hope what you hate isnt asked

I m familiar almost 50 to 75 % syllabus of chemistry. ....what will be better ? To choose chemistry or other two unknown subjects instead of chemistry ?

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Yes
Chemistry is a scoring subject if prepared well

chemistry is scoring subject but need your full concentration.