Aldehydes And Ketones Test

Result

Aldehydes And Ketones Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following will not undergo Cannizaro reaction?

A
Formaldehyde

B
Benzaldehyde

C
Acetaldehyde

D
Trimethylacetaldehyde

Solution

Only the aldehydes that do not have any α-hydrogen undergo Cannizaro reaction (disproportionation) in the presence of a strong alkali.

CH₃CHO (acetaldehyde) has three α-hydrogens.

Hence, acetaldehyde will not undergo disproportionation in the presence of a strong alkali.
Question 2
1 / -0

Write the following acids in the decreasing order of acidic strength?

(i) Oxalic acid
(ii) Acetic acid
(iii) Succinic acid

A
(i) > (ii) > (iii)

B
(i) > (iii) > (ii)

C
(ii) > (iii) > (i)

D
(iii) > (i) > (ii)

Solution

Dicarboxylic acids are more acidic than the monocarboxylic acids.
Oxalic acid is more acidic than succinic acid as there is no +I effect from the alkyl groups.