(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.
Aldehydes are more reactive towards nucleophillic addition reactions. 1.inductive effect : since carbonyl group of ketones is connected to alkyl groups,and alkyl group has electron donating inductive effect,it increases electron density on carbon of carbonyl group in ketones,making it less electrophilic. Therefore nucleophiles fail to attack ketones'carbonyl grp. And hence aldehydes are more reactive.