First compound :

Here priority of the groups are -NH2, -CH2CH3, -CH3, -H. groups are arranged in counter cockwise manner and lowest priority group is on plane of the paper. The configuration is R

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Second compound

Here priority of the groups are -Br,-CH=Ch2, -CH3 and -H. groups are arranged in counter cockwise manner and lowest priority group is on plane of the paper. The configuration is R