The correct configuration assigned for compounds (I) and (II) respectively are:

R, R

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S, S

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R, S

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S, R

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Solution

The correct option is C R, S
The correct configuration assigned for compounds (I) and (II) respectively are R, S.
In case of compound (I) the order of priority is $- O H > - C O O H > - C H_{3} > - H .$
The lowest priority group is on the left hand side and the order of rotation is anticlockwise.
This results in R configuration.
In case of compound (II), the order of priority is $- O H > - C H_{2} C H_{3} > - C H_{2} > - H$
The lowest priority group is below the plane of the paper i.e. on dash position and the order of rotation is clockwise. This leads to R configuration.

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