Cinnamaldehyde is prepared by the treatment of :
(a) benzaldehyde with acetaldehyde in the presence of NaOH
(b) benzaldehyde with formaldehyde in the presence of NaOH
(c) benzophenone with acetaldehyde in the presence of NaOH
(d) benzophenone with formaldehyde in the presence of NaOH
(a) benzaldehyde with acetaldehyde in the presence of NaOH
(b) benzaldehyde with formaldehyde in the presence of NaOH
(c) benzophenone with acetaldehyde in the presence of NaOH
(d) benzophenone with formaldehyde in the presence of NaOH