Question

For making distinction between 2-pentanone and 3-pentanone, the reagent to be employed is:

• A. $K_{2}C{r}_2{O}_7/H_{2}S{O}_4$
• B. $Zn-Hg/HCl$
• C. $Se{O}_2$
• D. $Iodine/NaOH$

Answer 1

The correct option is D $Iodine/NaOH$

Ketones having $C{H}_{3}CO-$ group give yellow coloured iodoform with $I_2$ and $NaOH$
$\therefore I_2/NaOH$ is used to distinguish between 2-pentanone and 3-pentanone.