Which compounds among the following give positive iodoform test?
Which compounds among the following give positive iodoform test?
(i), (iii) and (vi)
(iii), (iv) and (v)
(i), (ii) and (v)
(ii), (iv) and (vi)
Solution
A positive iodoform test is given by compounds having $\mathrm{CH}_3 \mathrm{CO}$ group in their structure. When iodine and sodium hydroxide are added to a compound that contains $\mathrm{CH}_3 \mathrm{CO}$ group in $\alpha$-position, a pale yellow precipitate of iodoform is formed.
So, compounds (i), (ii) and (v) have $\mathrm{CH}_3 \mathrm{CO}$ group.
Hence, they will give positive iodoform test.
