The Total solution for NCERT class 6-12
Which of the following compounds would undergo aldolcondensation, which the Cannizzaro reaction and which neither? Write thestructures of the expected products of aldol condensation and Cannizzaroreaction.
(iii) Benzaldehyde (iv) Benzophenone
(v) Cyclohexanone (vi) 1-Phenylpropanone
(vii) Phenylacetaldehyde (viii) Butan-1-ol
Aldehydes and ketones having at least one α-hydrogenundergo aldol condensation. The compounds (ii) 2−methylpentanal, (v)cyclohexanone, (vi) 1-phenylpropanone, and (vii) phenylacetaldehyde contain oneor more α-hydrogen atoms. Therefore, these undergo aldol condensation.
Aldehydes having no α-hydrogen atoms undergo Cannizzaroreactions. The compounds (i) Methanal, (iii) Benzaldehyde, and (ix) 2,2-dimethylbutanal do not have any α-hydrogen. Therefore, these undergocannizzaro reactions.
Compound (iv) Benzophenone is a ketone having noα-hydrogen atom and compound (viii) Butan-1-ol is an alcohol. Hence, thesecompounds do not undergo either aldol condensation or cannizzaro reactions.
Aldol condensation
(v)
(vi)
(vii)
Cannizzaro reaction
(i)
(iii)