231539
The correct increasing order of the acid strength of benzoic acid (I), 4-nitrobenzoic acid (II), 3,4-dinitrobenzoic acid (III) and 4methoxybenzoic acid (IV) is
1 I $<$ II $<$ III $<$ IV
2 II $<$ I $<$ IV $<$ III
3 IV $<$ I $<$ II $<$ III
4 IV $<$ II $<$ I $<$ III
5 I $<$ IV $<$ II $<$ III
Explanation:
The structure of all four carboxylic acid is- As we known that the $+\mathrm{M}$ effect decrease the acidity because by the $+\mathrm{M}$ effect the electron bushed by delocalization to carboxylic group and $-\mathrm{I}$ and $-\mathrm{M}$ effect increase the acidity of carboxylic acid. Hence the order of acidity is- $\text { IV }<\text { I }<\text { II }<\text { III }$
Kerala CEE-2014
GENERAL ORGANIC CHEMISTRY
231540
Among the following the ambident nucleophile is
1 iodide
2 alkoxy
3 hydroxyl
4 hydride
5 cyanide
Explanation:
The possible structures of all nucleophile is-
Kerala CEE-2015
GENERAL ORGANIC CHEMISTRY
231541
The strongest base among the following is
1 Amide ion
2 Hydroxide ion
3 Trimethylamine
4 Ammonia
5 Aniline
Explanation:
The structure of all base is- \(\stackrel{\ominus}{\mathrm{N}} \mathrm{H}_2\) is a strongest base because its conjugate acid is already a base and we are already know that if conjugate acid weak then their base is strong. The order of basicity is- $\stackrel{\ominus}{\mathrm{NH}_{2}}>\stackrel{\ominus}{\mathrm{O}} \mathrm{H}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}>\mathrm{NH}_{3}>\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}$
Kerala CEE-2017
GENERAL ORGANIC CHEMISTRY
231545
Among following, compound with the lowest $\mathrm{pK}_{\mathrm{a}}$ value, is :
1
2
3
4
Explanation:
$-\mathrm{OH}$ have $-\mathrm{M}$ and $+\mathrm{I}$ effect but $-\mathrm{M}$ is dominating factor. When $\mathrm{OH}$ is attached at ortho position of carboxylic acid. It shows ortho effect. Due to the ortho effect $\mathrm{H}$-bond is formed with-OH and carboxylate ion. Due to the ortho effect its acidity increase highly and its $\mathrm{pK}_{\mathrm{a}}$ value is lowest. Hence ' $\mathrm{a}$ ' is correct. The order of $\mathrm{pK}_{\mathrm{a}}$ value is-
Manipal 2020
GENERAL ORGANIC CHEMISTRY
231546
Relative acidity of the following is in the order :
Carboxylic acid is more acidic than alcohol. $\mathrm{R}-\mathrm{COOH}$ is more acidic than $\mathrm{H}_{2} \mathrm{CO}_{3}$ and have high $+\mathrm{I}-$ effect than the $\mathrm{RCOOH} . \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}$ have more acidic than $\mathrm{H}_{2} \mathrm{O}$ and $\mathrm{R}-\mathrm{OH}$ because delocalization of phenoxide ion. $\mathrm{H}_{2} \mathrm{O}$ is more acidic than $\mathrm{R}-\mathrm{OH}$. Hence the order of acidity is- $\mathrm{R}-\mathrm{COOH}>\mathrm{H}_{2} \mathrm{CO}_{3}>\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}>\mathrm{H}_{2} \mathrm{O}>\mathrm{ROH}$ Hence ' $a$ ' option is correct.
231539
The correct increasing order of the acid strength of benzoic acid (I), 4-nitrobenzoic acid (II), 3,4-dinitrobenzoic acid (III) and 4methoxybenzoic acid (IV) is
1 I $<$ II $<$ III $<$ IV
2 II $<$ I $<$ IV $<$ III
3 IV $<$ I $<$ II $<$ III
4 IV $<$ II $<$ I $<$ III
5 I $<$ IV $<$ II $<$ III
Explanation:
The structure of all four carboxylic acid is- As we known that the $+\mathrm{M}$ effect decrease the acidity because by the $+\mathrm{M}$ effect the electron bushed by delocalization to carboxylic group and $-\mathrm{I}$ and $-\mathrm{M}$ effect increase the acidity of carboxylic acid. Hence the order of acidity is- $\text { IV }<\text { I }<\text { II }<\text { III }$
Kerala CEE-2014
GENERAL ORGANIC CHEMISTRY
231540
Among the following the ambident nucleophile is
1 iodide
2 alkoxy
3 hydroxyl
4 hydride
5 cyanide
Explanation:
The possible structures of all nucleophile is-
Kerala CEE-2015
GENERAL ORGANIC CHEMISTRY
231541
The strongest base among the following is
1 Amide ion
2 Hydroxide ion
3 Trimethylamine
4 Ammonia
5 Aniline
Explanation:
The structure of all base is- \(\stackrel{\ominus}{\mathrm{N}} \mathrm{H}_2\) is a strongest base because its conjugate acid is already a base and we are already know that if conjugate acid weak then their base is strong. The order of basicity is- $\stackrel{\ominus}{\mathrm{NH}_{2}}>\stackrel{\ominus}{\mathrm{O}} \mathrm{H}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}>\mathrm{NH}_{3}>\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}$
Kerala CEE-2017
GENERAL ORGANIC CHEMISTRY
231545
Among following, compound with the lowest $\mathrm{pK}_{\mathrm{a}}$ value, is :
1
2
3
4
Explanation:
$-\mathrm{OH}$ have $-\mathrm{M}$ and $+\mathrm{I}$ effect but $-\mathrm{M}$ is dominating factor. When $\mathrm{OH}$ is attached at ortho position of carboxylic acid. It shows ortho effect. Due to the ortho effect $\mathrm{H}$-bond is formed with-OH and carboxylate ion. Due to the ortho effect its acidity increase highly and its $\mathrm{pK}_{\mathrm{a}}$ value is lowest. Hence ' $\mathrm{a}$ ' is correct. The order of $\mathrm{pK}_{\mathrm{a}}$ value is-
Manipal 2020
GENERAL ORGANIC CHEMISTRY
231546
Relative acidity of the following is in the order :
Carboxylic acid is more acidic than alcohol. $\mathrm{R}-\mathrm{COOH}$ is more acidic than $\mathrm{H}_{2} \mathrm{CO}_{3}$ and have high $+\mathrm{I}-$ effect than the $\mathrm{RCOOH} . \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}$ have more acidic than $\mathrm{H}_{2} \mathrm{O}$ and $\mathrm{R}-\mathrm{OH}$ because delocalization of phenoxide ion. $\mathrm{H}_{2} \mathrm{O}$ is more acidic than $\mathrm{R}-\mathrm{OH}$. Hence the order of acidity is- $\mathrm{R}-\mathrm{COOH}>\mathrm{H}_{2} \mathrm{CO}_{3}>\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}>\mathrm{H}_{2} \mathrm{O}>\mathrm{ROH}$ Hence ' $a$ ' option is correct.
231539
The correct increasing order of the acid strength of benzoic acid (I), 4-nitrobenzoic acid (II), 3,4-dinitrobenzoic acid (III) and 4methoxybenzoic acid (IV) is
1 I $<$ II $<$ III $<$ IV
2 II $<$ I $<$ IV $<$ III
3 IV $<$ I $<$ II $<$ III
4 IV $<$ II $<$ I $<$ III
5 I $<$ IV $<$ II $<$ III
Explanation:
The structure of all four carboxylic acid is- As we known that the $+\mathrm{M}$ effect decrease the acidity because by the $+\mathrm{M}$ effect the electron bushed by delocalization to carboxylic group and $-\mathrm{I}$ and $-\mathrm{M}$ effect increase the acidity of carboxylic acid. Hence the order of acidity is- $\text { IV }<\text { I }<\text { II }<\text { III }$
Kerala CEE-2014
GENERAL ORGANIC CHEMISTRY
231540
Among the following the ambident nucleophile is
1 iodide
2 alkoxy
3 hydroxyl
4 hydride
5 cyanide
Explanation:
The possible structures of all nucleophile is-
Kerala CEE-2015
GENERAL ORGANIC CHEMISTRY
231541
The strongest base among the following is
1 Amide ion
2 Hydroxide ion
3 Trimethylamine
4 Ammonia
5 Aniline
Explanation:
The structure of all base is- \(\stackrel{\ominus}{\mathrm{N}} \mathrm{H}_2\) is a strongest base because its conjugate acid is already a base and we are already know that if conjugate acid weak then their base is strong. The order of basicity is- $\stackrel{\ominus}{\mathrm{NH}_{2}}>\stackrel{\ominus}{\mathrm{O}} \mathrm{H}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}>\mathrm{NH}_{3}>\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}$
Kerala CEE-2017
GENERAL ORGANIC CHEMISTRY
231545
Among following, compound with the lowest $\mathrm{pK}_{\mathrm{a}}$ value, is :
1
2
3
4
Explanation:
$-\mathrm{OH}$ have $-\mathrm{M}$ and $+\mathrm{I}$ effect but $-\mathrm{M}$ is dominating factor. When $\mathrm{OH}$ is attached at ortho position of carboxylic acid. It shows ortho effect. Due to the ortho effect $\mathrm{H}$-bond is formed with-OH and carboxylate ion. Due to the ortho effect its acidity increase highly and its $\mathrm{pK}_{\mathrm{a}}$ value is lowest. Hence ' $\mathrm{a}$ ' is correct. The order of $\mathrm{pK}_{\mathrm{a}}$ value is-
Manipal 2020
GENERAL ORGANIC CHEMISTRY
231546
Relative acidity of the following is in the order :
Carboxylic acid is more acidic than alcohol. $\mathrm{R}-\mathrm{COOH}$ is more acidic than $\mathrm{H}_{2} \mathrm{CO}_{3}$ and have high $+\mathrm{I}-$ effect than the $\mathrm{RCOOH} . \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}$ have more acidic than $\mathrm{H}_{2} \mathrm{O}$ and $\mathrm{R}-\mathrm{OH}$ because delocalization of phenoxide ion. $\mathrm{H}_{2} \mathrm{O}$ is more acidic than $\mathrm{R}-\mathrm{OH}$. Hence the order of acidity is- $\mathrm{R}-\mathrm{COOH}>\mathrm{H}_{2} \mathrm{CO}_{3}>\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}>\mathrm{H}_{2} \mathrm{O}>\mathrm{ROH}$ Hence ' $a$ ' option is correct.
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GENERAL ORGANIC CHEMISTRY
231539
The correct increasing order of the acid strength of benzoic acid (I), 4-nitrobenzoic acid (II), 3,4-dinitrobenzoic acid (III) and 4methoxybenzoic acid (IV) is
1 I $<$ II $<$ III $<$ IV
2 II $<$ I $<$ IV $<$ III
3 IV $<$ I $<$ II $<$ III
4 IV $<$ II $<$ I $<$ III
5 I $<$ IV $<$ II $<$ III
Explanation:
The structure of all four carboxylic acid is- As we known that the $+\mathrm{M}$ effect decrease the acidity because by the $+\mathrm{M}$ effect the electron bushed by delocalization to carboxylic group and $-\mathrm{I}$ and $-\mathrm{M}$ effect increase the acidity of carboxylic acid. Hence the order of acidity is- $\text { IV }<\text { I }<\text { II }<\text { III }$
Kerala CEE-2014
GENERAL ORGANIC CHEMISTRY
231540
Among the following the ambident nucleophile is
1 iodide
2 alkoxy
3 hydroxyl
4 hydride
5 cyanide
Explanation:
The possible structures of all nucleophile is-
Kerala CEE-2015
GENERAL ORGANIC CHEMISTRY
231541
The strongest base among the following is
1 Amide ion
2 Hydroxide ion
3 Trimethylamine
4 Ammonia
5 Aniline
Explanation:
The structure of all base is- \(\stackrel{\ominus}{\mathrm{N}} \mathrm{H}_2\) is a strongest base because its conjugate acid is already a base and we are already know that if conjugate acid weak then their base is strong. The order of basicity is- $\stackrel{\ominus}{\mathrm{NH}_{2}}>\stackrel{\ominus}{\mathrm{O}} \mathrm{H}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}>\mathrm{NH}_{3}>\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}$
Kerala CEE-2017
GENERAL ORGANIC CHEMISTRY
231545
Among following, compound with the lowest $\mathrm{pK}_{\mathrm{a}}$ value, is :
1
2
3
4
Explanation:
$-\mathrm{OH}$ have $-\mathrm{M}$ and $+\mathrm{I}$ effect but $-\mathrm{M}$ is dominating factor. When $\mathrm{OH}$ is attached at ortho position of carboxylic acid. It shows ortho effect. Due to the ortho effect $\mathrm{H}$-bond is formed with-OH and carboxylate ion. Due to the ortho effect its acidity increase highly and its $\mathrm{pK}_{\mathrm{a}}$ value is lowest. Hence ' $\mathrm{a}$ ' is correct. The order of $\mathrm{pK}_{\mathrm{a}}$ value is-
Manipal 2020
GENERAL ORGANIC CHEMISTRY
231546
Relative acidity of the following is in the order :
Carboxylic acid is more acidic than alcohol. $\mathrm{R}-\mathrm{COOH}$ is more acidic than $\mathrm{H}_{2} \mathrm{CO}_{3}$ and have high $+\mathrm{I}-$ effect than the $\mathrm{RCOOH} . \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}$ have more acidic than $\mathrm{H}_{2} \mathrm{O}$ and $\mathrm{R}-\mathrm{OH}$ because delocalization of phenoxide ion. $\mathrm{H}_{2} \mathrm{O}$ is more acidic than $\mathrm{R}-\mathrm{OH}$. Hence the order of acidity is- $\mathrm{R}-\mathrm{COOH}>\mathrm{H}_{2} \mathrm{CO}_{3}>\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}>\mathrm{H}_{2} \mathrm{O}>\mathrm{ROH}$ Hence ' $a$ ' option is correct.
231539
The correct increasing order of the acid strength of benzoic acid (I), 4-nitrobenzoic acid (II), 3,4-dinitrobenzoic acid (III) and 4methoxybenzoic acid (IV) is
1 I $<$ II $<$ III $<$ IV
2 II $<$ I $<$ IV $<$ III
3 IV $<$ I $<$ II $<$ III
4 IV $<$ II $<$ I $<$ III
5 I $<$ IV $<$ II $<$ III
Explanation:
The structure of all four carboxylic acid is- As we known that the $+\mathrm{M}$ effect decrease the acidity because by the $+\mathrm{M}$ effect the electron bushed by delocalization to carboxylic group and $-\mathrm{I}$ and $-\mathrm{M}$ effect increase the acidity of carboxylic acid. Hence the order of acidity is- $\text { IV }<\text { I }<\text { II }<\text { III }$
Kerala CEE-2014
GENERAL ORGANIC CHEMISTRY
231540
Among the following the ambident nucleophile is
1 iodide
2 alkoxy
3 hydroxyl
4 hydride
5 cyanide
Explanation:
The possible structures of all nucleophile is-
Kerala CEE-2015
GENERAL ORGANIC CHEMISTRY
231541
The strongest base among the following is
1 Amide ion
2 Hydroxide ion
3 Trimethylamine
4 Ammonia
5 Aniline
Explanation:
The structure of all base is- \(\stackrel{\ominus}{\mathrm{N}} \mathrm{H}_2\) is a strongest base because its conjugate acid is already a base and we are already know that if conjugate acid weak then their base is strong. The order of basicity is- $\stackrel{\ominus}{\mathrm{NH}_{2}}>\stackrel{\ominus}{\mathrm{O}} \mathrm{H}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}>\mathrm{NH}_{3}>\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}$
Kerala CEE-2017
GENERAL ORGANIC CHEMISTRY
231545
Among following, compound with the lowest $\mathrm{pK}_{\mathrm{a}}$ value, is :
1
2
3
4
Explanation:
$-\mathrm{OH}$ have $-\mathrm{M}$ and $+\mathrm{I}$ effect but $-\mathrm{M}$ is dominating factor. When $\mathrm{OH}$ is attached at ortho position of carboxylic acid. It shows ortho effect. Due to the ortho effect $\mathrm{H}$-bond is formed with-OH and carboxylate ion. Due to the ortho effect its acidity increase highly and its $\mathrm{pK}_{\mathrm{a}}$ value is lowest. Hence ' $\mathrm{a}$ ' is correct. The order of $\mathrm{pK}_{\mathrm{a}}$ value is-
Manipal 2020
GENERAL ORGANIC CHEMISTRY
231546
Relative acidity of the following is in the order :
Carboxylic acid is more acidic than alcohol. $\mathrm{R}-\mathrm{COOH}$ is more acidic than $\mathrm{H}_{2} \mathrm{CO}_{3}$ and have high $+\mathrm{I}-$ effect than the $\mathrm{RCOOH} . \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}$ have more acidic than $\mathrm{H}_{2} \mathrm{O}$ and $\mathrm{R}-\mathrm{OH}$ because delocalization of phenoxide ion. $\mathrm{H}_{2} \mathrm{O}$ is more acidic than $\mathrm{R}-\mathrm{OH}$. Hence the order of acidity is- $\mathrm{R}-\mathrm{COOH}>\mathrm{H}_{2} \mathrm{CO}_{3}>\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}>\mathrm{H}_{2} \mathrm{O}>\mathrm{ROH}$ Hence ' $a$ ' option is correct.
