Which of the following carboxylic acids decarboxylates most readily when heated alone:
${C H}_{3} - {C H}_{2} - C O O H$
${C H}_{3} - C O - {C H}_{2} - C O O H$

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Solution

Since $β$ -keto acids are unstable acids, These acids readily under go decarboxylation through a cyclic transition state.
Hence $C H_{3} C O C H_{2} C O O H$ will decarboxylate most readily.

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Q. Which is the stronger acid in each of the following pairs?
(i)

C H_{3} - C O O H

and

C H_{2} = C H - C O O H

(ii)

C_{6} H_{5} - C O O H

and

C_{6} H_{5} - C H_{2} - C O O H

(iii)

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

and

C H_{3} - C H | O H - C O O H

Q. The rate of decarboxylation in soda lime process for the following will be:
(a)

H C = C - C O O H

(b)

C H_{2} = C H - C O O H

(c)

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

Q. Name the functional groups present in the following compounds.
(i)

{C H}_{2} - C O - C H_{2} - {C H}_{2} - {C H}_{2} - {C H}_{3}

(ii)

{C H}_{3} - C H_{2} - {C H}_{2} - C O O H

(iii)

{C H}_{3} {- C H}_{2} - {C H}_{2} - {C H}_{2} - C H O

(iv)

{C H}_{3} - {C H}_{2} - O H

Name the functional groups present in the following compounds: [5 MARKS]

1. ${CH}_{3} - {CH}_{2} - {CH}_{2} - OH$
2. ${CH}_{3} - {CH}_{2} - {CH}_{2} - COOH$
3. ${CH}_{3} - {CH}_{2} - CHO$
4. ${CH}_{3} - CO - {CH}_{2} - {CH}_{3}$
5. ${CH}_{3} - {CH}_{2} - CO-OH$

Q. Write IUPAC names of the following

@CH3-CH2-CH=CH2
@CH3-CH2-CH2-C(CH3)2-CH3
@CH3-CH2-CHO
@CH3-CH(OH)-CH3
@CH3-CH2-CH2-COOH

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Which of the following carboxylic acids decarboxylates most readily when heated alone:CH3−CH2−COOHCH3−CO−CH2−COOH

Since β-keto acids are unstable acids, These acids readily under go decarboxylation through a cyclic transition state.Hence CH3COCH2COOH will decarboxylate most readily.

Which of the following carboxylic acids decarboxylates most readily when heated alone:
${C H}_{3} - {C H}_{2} - C O O H$
${C H}_{3} - C O - {C H}_{2} - C O O H$

Since $β$ -keto acids are unstable acids, These acids readily under go decarboxylation through a cyclic transition state.
Hence $C H_{3} C O C H_{2} C O O H$ will decarboxylate most readily.