The rate law for substitution of 2-bromobutane with HO^--- in 75% ethanol 25% water at 30 degrees centigrade is

Rate = 3.2 x 10^---5[2-bromobutane][HO^---] 1.5 x 10^---6[2-bromobutane]

What % of reaction takes place by SN2 when

a) [HO^---] = 1 M

b) [HO^---] = 0.001 M

'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