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Q.
Reactivity of $PhMgBr$ with the following in the decreasing order is:
Haloalkanes and Haloarenes
Solution:
EDG (Me group) at $o-, m-$ and $p-$ positions: At ortho-position, ED power of $( Me -)$ group is more than $p$ and $m$ (due to $+ I$ effect and hyperconjugation effect). ED power of $(Me-)$ group at $p$-position is slightly less than the $Me$ group at ortho-position (due to less $+ I$ effect, but equal hyper conjugative effect). So the order of ED power of $( Me -)$ group is $o>p>m-$. NA is favoured by less-substituted EDG or more substituted EWG. So, the order of reactivity of $PhMgBr$ with aromatic aldehyde is
