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Q.
Reactivity of $MeMgBr$ with the following in the decreasing order is:
Haloalkanes and Haloarenes
Solution:
The order of reactivity of G.R. with different functional groups is aliphatic aldehyde $>$ aromatic $>$ aldehyde $>$ aliphatic ketone $>$ aromatic ketone. Also, EWG favours NA reaction
iv. is aliphatic ketone with $-I$ effect of $Ph$ group.
$ (+R$ effect is not possible since the double bond of benzene ring is not in conjugation with ( $C = O )$ group. So, (iv) is the most reactive ketone
Hence, the order is $iv > i > ii > iii$
