What common symmetry elements if any are found in the stable chair conformer of trans-1,2-dichlorocyclohexane?
A) a single mirror plane and a C₂ rotational axis.
B) a single mirror plane and a C₃ rotational axis.
C) two orthogonal mirror planes and a C₂ rotational axis.
D) a single C₂ rotational axis but no mirror plane.

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane