Which of the following order is correct ?

(a)2>4>1>3

(b) 2>4>3

(c) 1>2>3>4

(d) 2>3>4>1

'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