IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry - why NO2 group show its effect only at ortho and para but not at meta

ramkumar_november

KCN is predominantly ionic.... so it gives cyanide ion.......

R-X + KCN ---------> R-CN + KX

in this reaction the negative charge on the carbon atom attacks the R group so we get R-CN

AgCN is predominantly covalent

R-X + AgCN ----------> R-NC + AgX

in this reaction the lone pair on the nitrogen atom attacks the R group
so we get R-NC........

in electrophilic reactions chlorine is ortho para directing because
if you draw the resonance structures of chlorobenzene there will be negative charge only on the ortho and para position..... so they are vulnerable for electrophilic attack..................

are you clear with my answer?

Ask & Discuss Questions with Community & Experts