Question

Which of the following ketone will not give yellow precipitate with $NaOH/I_2?$

• A. 2-Pentanone
• B. Benzophenone
• C. Acetone
• D. 2-Hexanone

Answer 1

The correct option is B Benzophenone

(a)

(b) $Ph-\stackrel{\stackrel{O}{|}|}{C}-Ph$ (No methyl ketone) (negative iodoform test)
(c) $Me-\stackrel{\stackrel{O}{|}|}{C}-Me$ (Methyl ketone) (positive iodoform test)
(d)