Which of the following alcohol give positive iodoform test?

Question

Which of the following alcohol give positive iodoform test? (A) Methanol (B) Ethyl carbinol (C) Pentanol-3 (D) Methyl carbinol

Tardigrade Admin · Accepted Answer

lodoform test is given by alcohols which produce carbonyl compounds having

C H_{3} CO

group.
(i)

C H_{3} O H [O] H C H O

, no

C H_{3} CO

group, no iodoform test
(ii)

methyl carbinol C_{2} H_{5} O H [O] C H_{3} C H O

,
has

C H_{3} CO

group, gives iodoform test
(iii)

ethyl carbinol C_{2} H_{5} C H_{2} O H [O] C_{2} H_{5} C H O

,
no

C H_{3} CO

group no iodoform test.
(iv)

C H_{3} - C H_{2} - C H (O H) - C H_{2} - C H_{3} [O]

C H_{3} - C H_{2} - C ∣∣ O - C H_{2} - C H_{3}

NO

C H_{3} CO

group, no iodoform test.

∴

Only methyl carbinol gives iodoform test.

Q. Which of the following alcohol give positive iodoform test?