© examsnet.com
Question : 9
Total: 26
How do you convert the following ?
(a) Ethanal to Propanone
(b) Toluene to Benzoic acid
OR
Account for the following:
(a) Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.
(b)pK a
(a) Ethanal to Propanone
(b) Toluene to Benzoic acid
OR
Account for the following:
(a) Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.
(b)
Solution:
(a) CH 3 CHO
CH 3 CH ( OH ) CH 3
CH 3 COCH 3
(a) because the carboxyl group is deactivating and the catalyst aluminium chloride (Lewis acid) gets bonded to the carboxyl group
(b) Nitro group is an electron withdrawing group (-I effect) so it stabilises the carboxylate anion and strengthens the acid/ due to the presence of an electron withdrawing nitro group (-I effect).
OR
(a) because the carboxyl group is deactivating and the catalyst aluminium chloride (Lewis acid) gets bonded to the carboxyl group
(b) Nitro group is an electron withdrawing group (-I effect) so it stabilises the carboxylate anion and strengthens the acid/ due to the presence of an electron withdrawing nitro group (-I effect).
© examsnet.com
Go to Question: