Question

Write tests to distinguish between :
(i) CH₃CHO and C₆H₅CHO
(ii) C₆H_{5 -} OH and CH₃COOH
(iii) Pentanal and Pentan-2-one

Answer 1

(i) CH₃CHO gives brick red ppt. with Fehling, C₆H₅CHO not.
(ii) Phenol does not give brisk effervescence but CH₃COOH gives this test with NaHCO₃.
(iii) Pentanal forms silver mirror but pentan-2-one does not.