Which of the following represents a gem di halide?

(a) ethylene dichloride

(b) 2,2-dichloropropane

(c) 1,3-dichloropropane

(d) 1,2-dichloropropane

'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