Aldehydes And Ketones Test

Result

Aldehydes And Ketones Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following carboxylic acids gives a red precipitate with Fehling solution?

A
HCOOH

B
CH₃COOH

C
CH₃CH₂COOH

D
CH₃CH(Cl)COOH

Solution

Formic acid can be easily oxidised to carbonic acid, even by mild oxidising agents like Fehling solution. A red precipitate of Cu₂O is obtained.
Question 2
1 / -0

Among the following, the oil of bitter almonds is:

A
CH₃-CO-CH₃

B
C₆H₅-CHO

C
CH₃-CHO

D
HCHO

Solution

HCN and benzaldehyde are the main components of the bitter almond oil, which has germicidal qualities.
Question 3
1 / -0

Select the most suitable reagent for converting propanol to propanoic acid.

A
KMnO₄, H⁺

B
KMnO₄, OH^-

C
K₂Cr₂O₇, H⁺

D
Cu, 300^oC

Solution

Heating with Cu oxidises the alcohols up to the aldehyde stage.
Acidic medium is avoided because in the presence of an acid catalyst, the carboxylic acid formed reacts with the unreacted alcohol to give ester as the major product.
Therefore, KMnO₄ in an alkaline medium is used the oxidising agent. However, the product formed is a potassium salt of the acid, and has to be hydrolysed the get the acid.