What is the chemistry of aldehydes and ketones?
The chemistry of aldehydes and ketones is characterized by the versatile reactivity of the carbonyl group. In this experiment, you and a partner will be given an unknown aldehyde and an unknown ketone, and you will determine their identities by performing several chemical reactions. Oxidation by chromic acid
How do aldehydes and ketones react with 2-dinitrophenylhydrazine?
Aldehydes and ketones react with 2,4-dinitrophenylhydrazine reagent to form yellow, orange, or reddish-orange precipitates, whereas alcohols do not react. Formation of a precipitate therefore indicates the presence of an aldehyde or ketone. The precipitate from this test also serves as a solid derivative.
What is the most sensitive test for aldehydes?
The Schiff test is the most sensitive for aldehydes. However, the Schiff test is subject to giving false positives and false negatives. The iodoform test is for methyl ketones. Elemental iodine is first formed in situ by oxidizing iodide (I-) with hypochlorite (OCl-).
Do aldehydes react with alcohols?
Aldehydes and ketones react with 2,4-dinitrophenylhydrazine reagent to form yellow, orange, or reddish-orange precipitates, whereas alcohols do not react. Formation of a precipitate therefore indicates the presence of an aldehyde or ketone. The precipitate from this test also serves as a solid derivative.
Identification of an Unknown – Alcohols Aldehydes