Consider the Fischer projection formula for (S)-2-chlorobutane
Which of the following changes does not convert this structure to the (R)-enantiomer?
A) rotation 180º in the plane of the paper (or screen)
B) flipping the structure over (a 180º rotation out of the plane)
C) exchanging the two vertical substituents (i.e. top and bottom)
D) exchanging the two horizontal substituents (i.e. right and left)

'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