Which of the following does not turn Schiff's reagent to pink?

Schiff's reagent —  solution of rosaniline and sulphurous acid in water which is pink in colour and on passing SO₂ gas pink colour vanish out.

Aliphatic aldehydes – Immediately turns schiff's reagent to pink.

Aromatic aldehydes – slow reaction.

 Generally, ketones do not respond to the reaction of Schiff’s reagent. If the reaction is subjected to heat, then the reaction gives light pink colour. So, methyl ketones will not give  coloured product on reaction with Schiff’s reagent. So,  Acetone does not turn schiff's reagent to pink.