Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) Which set of the following compounds on reaction with an alkyl amine gives Schiff's base - Sarthaks eConnect

Which set of the following compounds on reaction with an alkyl amine gives Schiff's base

`HCHO, C_6H_5CHO, CH_3CHO`

`HCHO, NH_2OH, NH_2—NH_2`

`CH_3CHP, NH_2OH, NH_2—NH_2`

`CH_3COCH_3, C_2H_5OH`