Chemistry
JAMB 1987
Ethanol reacts with aqueous sodium mono-oxoio date (l) to give a bright yellow solid with a characteristic smell. The product is?
-
A.
trichloromethane
-
B.
triodomethane
-
C.
iodoethane
-
D.
ethanal
Correct Answer: Option B
Explanation
The reaction between ethanol and aqueous sodium mono-oxoiodate (I) (also known as sodium hypoiodite,) is a classic chemical test called the iodoform test. Sodium oxoiodate (I) acts as both an oxidizing and halogenating agent.
- Ethanol is first oxidized to ethanal.
- The ethanal further reacts with the iodine species to form triiodomethane (CH\(_3\)I), commonly known as iodoform.
- Triiodomethane is a bright yellow crystalline solid with a distinct, medicinal, or "characteristic" smell, which serves as a positive identification for alcohols containing the CH\(_3\)CH(OH) - group.
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