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CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323717 Assertion :
The ${pK}_{a}$ of acetic acid is lower than that of phenol
Reason :
Phenoxide ion is more resonance stabilised.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Acetic acid $(pKa = 4.76)$ is more acidic than phenol $(pKa = 10)$ . This is due to the greater resonance stabilization in the acetate ion compared to the phenoxide ion. So the option (3) is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323718 Assertion :
Peracids are stronger acids than corresponding carboxylic acids.
Reason :
The anion of carboxylic acids is stabilised by resonance but not that of peracids.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323719 The correct order for the acidic character of the following carboxylic acids is:
supporting img

1 IV

>

I

>

II

>

III

>

V

2 V

>

II

>

IV

>

I

>

III

3 V

>

II

>

III

>

I

>

IV

4 None of these

Explanation:

In option $(V)$ the conjugate base is stabilized by intramoleculaar $H$ -bonding from 2 ends.
supporting img
Options II & IV have ortho effect. Option III is least due to $+ M$ effect of $- OH$ group.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323720 The strongest acid amongst the following compounds is

1

{ClCH}_{2} {CH}_{2} {CH}_{2} COOH

2

{CH}_{3} {CH}_{2} CH (Cl) {CO}_{2} H

3

HCOOH

4

{CH}_{3} COOH

Explanation:

$- I$ effect exerting (electron withdrawing) groups increases the acidic strength of an acid by withdrawing electron density toward itself, thereby weakening $O - H$ bond; thus, the release of $H^{+}$ ion by an acid becomes easier.
However, +I effect exerting ( $e^{-}$ releasing) groups decreases the acidic strength by donating electron density to O-atom. Further, -I effect decreases with distance. Thus, the acidic strength of the given acids would be
supporting img

Hence,

is the most acidic and the strongest acid than other given compounds.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323721 The correct decreasing order for acid strength is

1

{FCH}_{2} COOH > {NCCH}_{2} COOH >

{NO}_{2} {CH}_{2} COOH > {ClCH}_{2} COOH

2

{CNCH}_{2} COOH > O_{2} {NCH}_{2} COOH >

{FCH}_{2} COOH > {ClCH}_{2} COOH

3

{NO}_{2} {CH}_{2} COOH > {NCCH}_{2} COOH >

{FCH}_{2} COOH > {ClCH}_{2} COOH

4

{NO}_{2} {CH}_{2} COOH > {FCH}_{2} COOH >

{CNCH}_{2} COOH > {ClCH}_{2} COOH

Explanation:

Order of electron withdrawing effect exerting group is $- {NO}_{2} > - CN > F > - Cl$ .
Hence, the acid strength order is
${NO}_{2} {NCH}_{2} COOH > {NCCH}_{2} COOH >$
${FCH}_{2} COOH > {ClCH}_{2} COOH$ .
acidic strength $α \frac{1}{-^{'} I^{'} e f f e c t}$

JEE - 2019

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323717 Assertion :
The ${pK}_{a}$ of acetic acid is lower than that of phenol
Reason :
Phenoxide ion is more resonance stabilised.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Acetic acid $(pKa = 4.76)$ is more acidic than phenol $(pKa = 10)$ . This is due to the greater resonance stabilization in the acetate ion compared to the phenoxide ion. So the option (3) is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323718 Assertion :
Peracids are stronger acids than corresponding carboxylic acids.
Reason :
The anion of carboxylic acids is stabilised by resonance but not that of peracids.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323719 The correct order for the acidic character of the following carboxylic acids is:
supporting img

1 IV

>

I

>

II

>

III

>

V

2 V

>

II

>

IV

>

I

>

III

3 V

>

II

>

III

>

I

>

IV

4 None of these

Explanation:

In option $(V)$ the conjugate base is stabilized by intramoleculaar $H$ -bonding from 2 ends.
supporting img
Options II & IV have ortho effect. Option III is least due to $+ M$ effect of $- OH$ group.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323720 The strongest acid amongst the following compounds is

1

{ClCH}_{2} {CH}_{2} {CH}_{2} COOH

2

{CH}_{3} {CH}_{2} CH (Cl) {CO}_{2} H

3

HCOOH

4

{CH}_{3} COOH

Explanation:

$- I$ effect exerting (electron withdrawing) groups increases the acidic strength of an acid by withdrawing electron density toward itself, thereby weakening $O - H$ bond; thus, the release of $H^{+}$ ion by an acid becomes easier.
However, +I effect exerting ( $e^{-}$ releasing) groups decreases the acidic strength by donating electron density to O-atom. Further, -I effect decreases with distance. Thus, the acidic strength of the given acids would be
supporting img

Hence,

is the most acidic and the strongest acid than other given compounds.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323721 The correct decreasing order for acid strength is

1

{FCH}_{2} COOH > {NCCH}_{2} COOH >

{NO}_{2} {CH}_{2} COOH > {ClCH}_{2} COOH

2

{CNCH}_{2} COOH > O_{2} {NCH}_{2} COOH >

{FCH}_{2} COOH > {ClCH}_{2} COOH

3

{NO}_{2} {CH}_{2} COOH > {NCCH}_{2} COOH >

{FCH}_{2} COOH > {ClCH}_{2} COOH

4

{NO}_{2} {CH}_{2} COOH > {FCH}_{2} COOH >

{CNCH}_{2} COOH > {ClCH}_{2} COOH

Explanation:

Order of electron withdrawing effect exerting group is $- {NO}_{2} > - CN > F > - Cl$ .
Hence, the acid strength order is
${NO}_{2} {NCH}_{2} COOH > {NCCH}_{2} COOH >$
${FCH}_{2} COOH > {ClCH}_{2} COOH$ .
acidic strength $α \frac{1}{-^{'} I^{'} e f f e c t}$

JEE - 2019

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323717 Assertion :
The ${pK}_{a}$ of acetic acid is lower than that of phenol
Reason :
Phenoxide ion is more resonance stabilised.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Acetic acid $(pKa = 4.76)$ is more acidic than phenol $(pKa = 10)$ . This is due to the greater resonance stabilization in the acetate ion compared to the phenoxide ion. So the option (3) is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323718 Assertion :
Peracids are stronger acids than corresponding carboxylic acids.
Reason :
The anion of carboxylic acids is stabilised by resonance but not that of peracids.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323719 The correct order for the acidic character of the following carboxylic acids is:
supporting img

1 IV

>

I

>

II

>

III

>

V

2 V

>

II

>

IV

>

I

>

III

3 V

>

II

>

III

>

I

>

IV

4 None of these

Explanation:

In option $(V)$ the conjugate base is stabilized by intramoleculaar $H$ -bonding from 2 ends.
supporting img
Options II & IV have ortho effect. Option III is least due to $+ M$ effect of $- OH$ group.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323720 The strongest acid amongst the following compounds is

1

{ClCH}_{2} {CH}_{2} {CH}_{2} COOH

2

{CH}_{3} {CH}_{2} CH (Cl) {CO}_{2} H

3

HCOOH

4

{CH}_{3} COOH

Explanation:

$- I$ effect exerting (electron withdrawing) groups increases the acidic strength of an acid by withdrawing electron density toward itself, thereby weakening $O - H$ bond; thus, the release of $H^{+}$ ion by an acid becomes easier.
However, +I effect exerting ( $e^{-}$ releasing) groups decreases the acidic strength by donating electron density to O-atom. Further, -I effect decreases with distance. Thus, the acidic strength of the given acids would be
supporting img

Hence,

is the most acidic and the strongest acid than other given compounds.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323721 The correct decreasing order for acid strength is

1

{FCH}_{2} COOH > {NCCH}_{2} COOH >

{NO}_{2} {CH}_{2} COOH > {ClCH}_{2} COOH

2

{CNCH}_{2} COOH > O_{2} {NCH}_{2} COOH >

{FCH}_{2} COOH > {ClCH}_{2} COOH

3

{NO}_{2} {CH}_{2} COOH > {NCCH}_{2} COOH >

{FCH}_{2} COOH > {ClCH}_{2} COOH

4

{NO}_{2} {CH}_{2} COOH > {FCH}_{2} COOH >

{CNCH}_{2} COOH > {ClCH}_{2} COOH

Explanation:

Order of electron withdrawing effect exerting group is $- {NO}_{2} > - CN > F > - Cl$ .
Hence, the acid strength order is
${NO}_{2} {NCH}_{2} COOH > {NCCH}_{2} COOH >$
${FCH}_{2} COOH > {ClCH}_{2} COOH$ .
acidic strength $α \frac{1}{-^{'} I^{'} e f f e c t}$

JEE - 2019

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323717 Assertion :
The ${pK}_{a}$ of acetic acid is lower than that of phenol
Reason :
Phenoxide ion is more resonance stabilised.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Acetic acid $(pKa = 4.76)$ is more acidic than phenol $(pKa = 10)$ . This is due to the greater resonance stabilization in the acetate ion compared to the phenoxide ion. So the option (3) is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323718 Assertion :
Peracids are stronger acids than corresponding carboxylic acids.
Reason :
The anion of carboxylic acids is stabilised by resonance but not that of peracids.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323719 The correct order for the acidic character of the following carboxylic acids is:
supporting img

1 IV

>

I

>

II

>

III

>

V

2 V

>

II

>

IV

>

I

>

III

3 V

>

II

>

III

>

I

>

IV

4 None of these

Explanation:

In option $(V)$ the conjugate base is stabilized by intramoleculaar $H$ -bonding from 2 ends.
supporting img
Options II & IV have ortho effect. Option III is least due to $+ M$ effect of $- OH$ group.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323720 The strongest acid amongst the following compounds is

1

{ClCH}_{2} {CH}_{2} {CH}_{2} COOH

2

{CH}_{3} {CH}_{2} CH (Cl) {CO}_{2} H

3

HCOOH

4

{CH}_{3} COOH

Explanation:

$- I$ effect exerting (electron withdrawing) groups increases the acidic strength of an acid by withdrawing electron density toward itself, thereby weakening $O - H$ bond; thus, the release of $H^{+}$ ion by an acid becomes easier.
However, +I effect exerting ( $e^{-}$ releasing) groups decreases the acidic strength by donating electron density to O-atom. Further, -I effect decreases with distance. Thus, the acidic strength of the given acids would be
supporting img

Hence,

is the most acidic and the strongest acid than other given compounds.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323721 The correct decreasing order for acid strength is

1

{FCH}_{2} COOH > {NCCH}_{2} COOH >

{NO}_{2} {CH}_{2} COOH > {ClCH}_{2} COOH

2

{CNCH}_{2} COOH > O_{2} {NCH}_{2} COOH >

{FCH}_{2} COOH > {ClCH}_{2} COOH

3

{NO}_{2} {CH}_{2} COOH > {NCCH}_{2} COOH >

{FCH}_{2} COOH > {ClCH}_{2} COOH

4

{NO}_{2} {CH}_{2} COOH > {FCH}_{2} COOH >

{CNCH}_{2} COOH > {ClCH}_{2} COOH

Explanation:

Order of electron withdrawing effect exerting group is $- {NO}_{2} > - CN > F > - Cl$ .
Hence, the acid strength order is
${NO}_{2} {NCH}_{2} COOH > {NCCH}_{2} COOH >$
${FCH}_{2} COOH > {ClCH}_{2} COOH$ .
acidic strength $α \frac{1}{-^{'} I^{'} e f f e c t}$

JEE - 2019

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323717 Assertion :
The ${pK}_{a}$ of acetic acid is lower than that of phenol
Reason :
Phenoxide ion is more resonance stabilised.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Acetic acid $(pKa = 4.76)$ is more acidic than phenol $(pKa = 10)$ . This is due to the greater resonance stabilization in the acetate ion compared to the phenoxide ion. So the option (3) is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323718 Assertion :
Peracids are stronger acids than corresponding carboxylic acids.
Reason :
The anion of carboxylic acids is stabilised by resonance but not that of peracids.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323719 The correct order for the acidic character of the following carboxylic acids is:
supporting img

1 IV

>

I

>

II

>

III

>

V

2 V

>

II

>

IV

>

I

>

III

3 V

>

II

>

III

>

I

>

IV

4 None of these

Explanation:

In option $(V)$ the conjugate base is stabilized by intramoleculaar $H$ -bonding from 2 ends.
supporting img
Options II & IV have ortho effect. Option III is least due to $+ M$ effect of $- OH$ group.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323720 The strongest acid amongst the following compounds is

1

{ClCH}_{2} {CH}_{2} {CH}_{2} COOH

2

{CH}_{3} {CH}_{2} CH (Cl) {CO}_{2} H

3

HCOOH

4

{CH}_{3} COOH

Explanation:

$- I$ effect exerting (electron withdrawing) groups increases the acidic strength of an acid by withdrawing electron density toward itself, thereby weakening $O - H$ bond; thus, the release of $H^{+}$ ion by an acid becomes easier.
However, +I effect exerting ( $e^{-}$ releasing) groups decreases the acidic strength by donating electron density to O-atom. Further, -I effect decreases with distance. Thus, the acidic strength of the given acids would be
supporting img

Hence,

is the most acidic and the strongest acid than other given compounds.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323721 The correct decreasing order for acid strength is

1

{FCH}_{2} COOH > {NCCH}_{2} COOH >

{NO}_{2} {CH}_{2} COOH > {ClCH}_{2} COOH

2

{CNCH}_{2} COOH > O_{2} {NCH}_{2} COOH >

{FCH}_{2} COOH > {ClCH}_{2} COOH

3

{NO}_{2} {CH}_{2} COOH > {NCCH}_{2} COOH >

{FCH}_{2} COOH > {ClCH}_{2} COOH

4

{NO}_{2} {CH}_{2} COOH > {FCH}_{2} COOH >

{CNCH}_{2} COOH > {ClCH}_{2} COOH

Explanation:

Order of electron withdrawing effect exerting group is $- {NO}_{2} > - CN > F > - Cl$ .
Hence, the acid strength order is
${NO}_{2} {NCH}_{2} COOH > {NCCH}_{2} COOH >$
${FCH}_{2} COOH > {ClCH}_{2} COOH$ .
acidic strength $α \frac{1}{-^{'} I^{'} e f f e c t}$

JEE - 2019

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