Question

Which one of the following shows haloform test?

• A. Butanol-2
• B. Butanol-1
• C. 2-methyl ketone
• D. 2-methyl propane

Answer 1

Answer: (A)

In haloform reaction, compounds having the structure
$R-\underset{\stackrel{|}{O}H}{\mathrm{CH}}-C{H}_3$ or $R-\underset{\stackrel{||}{O}}{C}-C{H}_3$
are treated with an excess of iodine solution and alkali to produce iodoform.
$\underset{\text{Butanol-2}}{\stackrel{1}{C{H}_3}\underset{\stackrel{|}{O}H}{\stackrel{2}{\mathrm{CH}}}-\stackrel{3}{C{H}_2}-\stackrel{4}{C{H}_3}}+\underset{\text{Halogen}}{NaOH+X_2}\to \underset{\text{Haloform}}{CH{X}_3}$
Therefore, $2$ -butanol responds to haloform test.