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B
S
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C
E
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D
Z
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Solution
The correct option is AR
Lowest priority atom is always away from the viewer. Priority is seen on the basic of atomic no and if atomic no. are same then on the basic of atomic mass. See in the order of higher to lower priority.
If clockwise then it is R.
If anticlockwise then it is S.
Nomenclsture of the molecule is (R)-1-bromo-1-chloroethane