NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
GENERAL ORGANIC CHEMISTRY
231364
The correct order of decreasing acid strength of trichloracetic acid (A), trifluoroacetic acid $(B)$, acetic acid $(C)$ and formic acid (D) is:
1 B $>$ A $>$ D $>$ C
2 $\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{A}$
3 A $>$ B $>$ C $>$ D
4 A $>$ C $>$ B $>$ D
Explanation:
As we know that - I effect increase the acidity of carboxylic acid and higher the electronegativity greater is the - I effect. Hence the decreasing order of acidity is- $\mathrm{CF}_{3} \mathrm{COOH}>\mathrm{CCl}_{3} \mathrm{COOH}$ $>\mathrm{HCOOH}>\mathrm{CH}_{3} \mathrm{COOH}$
BITSAT-2014
GENERAL ORGANIC CHEMISTRY
231366
Maximum $\mathrm{pK}_{\mathrm{b}}$ value is of
As we increase the basicity, the $\mathrm{pK}_{\mathrm{b}}$ value will decreases and as we decrease the basicity the $\mathrm{pK}_{\mathrm{b}}$ value will increases and also we know that the delocalization will decrease the basicity. Hence option (d) have maximum $\mathrm{pK}_{\mathrm{b}}$ value.
BITSAT-2017
GENERAL ORGANIC CHEMISTRY
231434
The strongest acid among the choices is
1 dichloroacetic acid
2 dimethylacetic acid
3 trifluoroacetic acid
4 triiodoacetic acid
Explanation:
+I effective group decrease the acidity of carboxylic acid and $-\mathrm{I}$ effective group increase the acidity. High electronegative element have high -I effect. Hence, the strongest acid is $\mathrm{CF}_{3} \mathrm{COOH}$. So, option (c) is correct. The decreasing order of acidity is$\mathrm{CF}_{3} \mathrm{COOH}>\mathrm{CCl}_{3} \mathrm{COOH}>\mathrm{Cl}_{3} \mathrm{COOH}>\mathrm{CH}_{3} \mathrm{COOH}$
J and K CET-(2012)
GENERAL ORGANIC CHEMISTRY
231381
The strongest ortho/para directing group is
1 $-\mathrm{NH}_{2}$
2 $-\mathrm{NH}_{3}$
3 $-\mathrm{Cl}$
4 $-\mathrm{C}_{2} \mathrm{H}_{5}$
Explanation:
Ortho/para directing group means attack of electrophile at ortho and para position. $+\mathrm{I}$ and $+\mathrm{m}$ effect is ortho/para directing but $+\mathrm{m}$ is more favorable $-\mathrm{I}$ effect is not ortho/para directing group. Hence, the $\mathrm{NH}_{2}$ is best ortho-para directing group.
231364
The correct order of decreasing acid strength of trichloracetic acid (A), trifluoroacetic acid $(B)$, acetic acid $(C)$ and formic acid (D) is:
1 B $>$ A $>$ D $>$ C
2 $\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{A}$
3 A $>$ B $>$ C $>$ D
4 A $>$ C $>$ B $>$ D
Explanation:
As we know that - I effect increase the acidity of carboxylic acid and higher the electronegativity greater is the - I effect. Hence the decreasing order of acidity is- $\mathrm{CF}_{3} \mathrm{COOH}>\mathrm{CCl}_{3} \mathrm{COOH}$ $>\mathrm{HCOOH}>\mathrm{CH}_{3} \mathrm{COOH}$
BITSAT-2014
GENERAL ORGANIC CHEMISTRY
231366
Maximum $\mathrm{pK}_{\mathrm{b}}$ value is of
As we increase the basicity, the $\mathrm{pK}_{\mathrm{b}}$ value will decreases and as we decrease the basicity the $\mathrm{pK}_{\mathrm{b}}$ value will increases and also we know that the delocalization will decrease the basicity. Hence option (d) have maximum $\mathrm{pK}_{\mathrm{b}}$ value.
BITSAT-2017
GENERAL ORGANIC CHEMISTRY
231434
The strongest acid among the choices is
1 dichloroacetic acid
2 dimethylacetic acid
3 trifluoroacetic acid
4 triiodoacetic acid
Explanation:
+I effective group decrease the acidity of carboxylic acid and $-\mathrm{I}$ effective group increase the acidity. High electronegative element have high -I effect. Hence, the strongest acid is $\mathrm{CF}_{3} \mathrm{COOH}$. So, option (c) is correct. The decreasing order of acidity is$\mathrm{CF}_{3} \mathrm{COOH}>\mathrm{CCl}_{3} \mathrm{COOH}>\mathrm{Cl}_{3} \mathrm{COOH}>\mathrm{CH}_{3} \mathrm{COOH}$
J and K CET-(2012)
GENERAL ORGANIC CHEMISTRY
231381
The strongest ortho/para directing group is
1 $-\mathrm{NH}_{2}$
2 $-\mathrm{NH}_{3}$
3 $-\mathrm{Cl}$
4 $-\mathrm{C}_{2} \mathrm{H}_{5}$
Explanation:
Ortho/para directing group means attack of electrophile at ortho and para position. $+\mathrm{I}$ and $+\mathrm{m}$ effect is ortho/para directing but $+\mathrm{m}$ is more favorable $-\mathrm{I}$ effect is not ortho/para directing group. Hence, the $\mathrm{NH}_{2}$ is best ortho-para directing group.
231364
The correct order of decreasing acid strength of trichloracetic acid (A), trifluoroacetic acid $(B)$, acetic acid $(C)$ and formic acid (D) is:
1 B $>$ A $>$ D $>$ C
2 $\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{A}$
3 A $>$ B $>$ C $>$ D
4 A $>$ C $>$ B $>$ D
Explanation:
As we know that - I effect increase the acidity of carboxylic acid and higher the electronegativity greater is the - I effect. Hence the decreasing order of acidity is- $\mathrm{CF}_{3} \mathrm{COOH}>\mathrm{CCl}_{3} \mathrm{COOH}$ $>\mathrm{HCOOH}>\mathrm{CH}_{3} \mathrm{COOH}$
BITSAT-2014
GENERAL ORGANIC CHEMISTRY
231366
Maximum $\mathrm{pK}_{\mathrm{b}}$ value is of
As we increase the basicity, the $\mathrm{pK}_{\mathrm{b}}$ value will decreases and as we decrease the basicity the $\mathrm{pK}_{\mathrm{b}}$ value will increases and also we know that the delocalization will decrease the basicity. Hence option (d) have maximum $\mathrm{pK}_{\mathrm{b}}$ value.
BITSAT-2017
GENERAL ORGANIC CHEMISTRY
231434
The strongest acid among the choices is
1 dichloroacetic acid
2 dimethylacetic acid
3 trifluoroacetic acid
4 triiodoacetic acid
Explanation:
+I effective group decrease the acidity of carboxylic acid and $-\mathrm{I}$ effective group increase the acidity. High electronegative element have high -I effect. Hence, the strongest acid is $\mathrm{CF}_{3} \mathrm{COOH}$. So, option (c) is correct. The decreasing order of acidity is$\mathrm{CF}_{3} \mathrm{COOH}>\mathrm{CCl}_{3} \mathrm{COOH}>\mathrm{Cl}_{3} \mathrm{COOH}>\mathrm{CH}_{3} \mathrm{COOH}$
J and K CET-(2012)
GENERAL ORGANIC CHEMISTRY
231381
The strongest ortho/para directing group is
1 $-\mathrm{NH}_{2}$
2 $-\mathrm{NH}_{3}$
3 $-\mathrm{Cl}$
4 $-\mathrm{C}_{2} \mathrm{H}_{5}$
Explanation:
Ortho/para directing group means attack of electrophile at ortho and para position. $+\mathrm{I}$ and $+\mathrm{m}$ effect is ortho/para directing but $+\mathrm{m}$ is more favorable $-\mathrm{I}$ effect is not ortho/para directing group. Hence, the $\mathrm{NH}_{2}$ is best ortho-para directing group.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
GENERAL ORGANIC CHEMISTRY
231364
The correct order of decreasing acid strength of trichloracetic acid (A), trifluoroacetic acid $(B)$, acetic acid $(C)$ and formic acid (D) is:
1 B $>$ A $>$ D $>$ C
2 $\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{A}$
3 A $>$ B $>$ C $>$ D
4 A $>$ C $>$ B $>$ D
Explanation:
As we know that - I effect increase the acidity of carboxylic acid and higher the electronegativity greater is the - I effect. Hence the decreasing order of acidity is- $\mathrm{CF}_{3} \mathrm{COOH}>\mathrm{CCl}_{3} \mathrm{COOH}$ $>\mathrm{HCOOH}>\mathrm{CH}_{3} \mathrm{COOH}$
BITSAT-2014
GENERAL ORGANIC CHEMISTRY
231366
Maximum $\mathrm{pK}_{\mathrm{b}}$ value is of
As we increase the basicity, the $\mathrm{pK}_{\mathrm{b}}$ value will decreases and as we decrease the basicity the $\mathrm{pK}_{\mathrm{b}}$ value will increases and also we know that the delocalization will decrease the basicity. Hence option (d) have maximum $\mathrm{pK}_{\mathrm{b}}$ value.
BITSAT-2017
GENERAL ORGANIC CHEMISTRY
231434
The strongest acid among the choices is
1 dichloroacetic acid
2 dimethylacetic acid
3 trifluoroacetic acid
4 triiodoacetic acid
Explanation:
+I effective group decrease the acidity of carboxylic acid and $-\mathrm{I}$ effective group increase the acidity. High electronegative element have high -I effect. Hence, the strongest acid is $\mathrm{CF}_{3} \mathrm{COOH}$. So, option (c) is correct. The decreasing order of acidity is$\mathrm{CF}_{3} \mathrm{COOH}>\mathrm{CCl}_{3} \mathrm{COOH}>\mathrm{Cl}_{3} \mathrm{COOH}>\mathrm{CH}_{3} \mathrm{COOH}$
J and K CET-(2012)
GENERAL ORGANIC CHEMISTRY
231381
The strongest ortho/para directing group is
1 $-\mathrm{NH}_{2}$
2 $-\mathrm{NH}_{3}$
3 $-\mathrm{Cl}$
4 $-\mathrm{C}_{2} \mathrm{H}_{5}$
Explanation:
Ortho/para directing group means attack of electrophile at ortho and para position. $+\mathrm{I}$ and $+\mathrm{m}$ effect is ortho/para directing but $+\mathrm{m}$ is more favorable $-\mathrm{I}$ effect is not ortho/para directing group. Hence, the $\mathrm{NH}_{2}$ is best ortho-para directing group.
