Assign `(R ) or (S)` designations to each of the following compounds
a)

Explanation

a) Priority order: `HC-=C- gtC(CH_(3))_(3)gtCH_(3)- gt H-`
Make two interchanges so that lowest priority `(H)` in on the dotted line

b) Priority order : `-OH gt -C (CH_(3))_(3) gt -CH=CH_(2)`

c)