In SN2 reactions, the correct order of reactivity for the following compounds: CH3Cl, CH3CH2Cl, (CH3)2CHCl and (CH3)3CCl is

(a) (CH3)2CHCl > CH3CH2Cl > CH3Cl > (CH3)3CCl

(b) CH3Cl > (CH3)2CHCl > CH3CH2Cl > (CH3)3CCl

(c) CH3Cl > CH3CH2Cl > (CH3)2CHCl > (CH3)3CCl

(d) CH3CH2Cl > CH3Cl > (CH3)2CHCl > (CH3)3CCl

'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