1.

KI dissolved in acetone undergoes S_(N^(2)) reaction with each of P,Q,R and S. the reaction rates vary as: .

Answer»

<P>`PgtQgtRgtS`
`SgtPgtRgtQ`
`PgtRgtQgtS`
`RgtPgtSgtQ`

Solution :
Relative reactivity order towards `S_(N^(2))` reaction is:
(S) is maximum rective SINCE electron withdrawing CARBONYL group `(gtC=0)` increases the polarity of `C-Cl` bond (P) is reactive due to least STERIC HINDRANCE. (R) is more reactive than (Q) as there is comparatively less steric hindrance.t his means that Q is the least reactive as has been shown in the reaction rates.


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