In the S_N2 reaction of iodide ion with (CH₃)₂CHCH₂CH₂X what is the order of decreasing reactivity for the following X substituents?
I X = -OH II X = CH₃CO₂- III X = CF₃SO₃- IV X = CCl₃CO₂-
A) I > II > III > IV
B) IV > III > II > I
C) III > II > IV > I
D) III > IV > II > I

'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