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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 A R
Lowest priority atom is always away from the viewer. Prioity is seen on the basis of atomic no. and if atomic no. are same then on the basis of atomic mass. If clockwise then it is R, if anticlockwise then it is S. Name of the molecule is, (R)1-bromo-1-chloroethane.