(couleur) grey (Grande-Bretagne) , gray (USA) il fait gris it's a dull day, it's a grey day. faire grise mine to look morose. faire grise mine Ã  qn to give sb a cool reception.
In electrophilic aromatic substitution, the benzene ring acts as an electron donor (Lewis base or nucleophile) and reacts with an electron acceptor (Lewis acid or electrophile). The result of electrophilic aromatic substitution reactions is that an aromatic hydrogen is replaced by some other atom or functional group.
Bromination on aromatic ring: toluene has one methyl group on aromatic group on benzene ring which imparts positive inductive effect and hyperconjugation. Because of these two effects, methyl groups increases the electron density on aromatic ring and acts as activating group.he methyl group on benzene ring in toluene is ortho and para directing and activating group due to hypercojugation and positive inductive effect of methyl group. Out of ortho and para products, ortho products are formed as major products around 63%, with para 34% and 3% meta products.