Question

Which one among the following reaction products gives iodoform test?

• A. $CH _{3} CH _{2} CH _{2} C \equiv N \xrightarrow [(ii)H_3O^+]{(i)C_6H_5MgBr}$
• B. $\left( C _{6} H _{5}\right)_{2} Cd \xrightarrow{CH_3COCl}$
• C. $CH _{2}= CHCH _{2} CH ( OH ) C _{6} H _{5} \xrightarrow {PCC}$
• D. $C _{6} H _{5} CH _{2} CN \xrightarrow [(ii)H)3O^+]{(i)C_6H_5MgBr}$

Answer 1

Answer: (B)

lodoform test It is used to check the presence of carbonyl compounds with the structure of $R - CO - CH _{3}$ or alcohols with the structure $RC - \underset{\overset{|}{H}}{C}H - CH _{3}$ in a given unknown substance.
The reaction of iodine, a base and a methyl ketone gives a yellow precipitate along with an antiseptic smell.