Question

Which one can differentiate between $ {{C}_{2}}{{H}_{5}}OH $ and $ C{{H}_{3}}OH $ ?

• A. $ {{H}_{2}}O $
• B. $ N{{a}_{2}}C{{O}_{3}}+{{I}_{2}} $
• C. $ N{{H}_{3}} $
• D. $ HCl $

Answer 1

Answer: (B)

$CH _{3} OH$ and $C _{2} H _{5} OH$ can be differentiated by using $Na _{2} CO _{3}$ and $I_{2}, C_{2} H_{5} O H$ gives yellow precipitate of $C H I_{3}$ whereas $C H_{3} O H$ does not react with it.
$C _{2} H _{5} OH +4 I _{2}+ Na _{2} CO _{3} \rightarrow \underset{\overset{\text{lodoform}}{\text{(yellow ppt.)}}}{CHI_3}+5 NaI + HCOONa +3 CO _{2}+ H _{2} O$