324097
Suitable explanation for the order of basic character \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N} < \left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\) is :
1 Steric hindrance by bulky methyl group
2 Higher volatility of \(3^{\circ}\) amine
3 Decreased capacity for H-bond formation with \(\mathrm{H}_{2} \mathrm{O}\)
4 Decreased electron-density at \(\mathrm{N}\) atom
Explanation:
Due to steric hindrance by methyl group.
CHXII13:AMINES
324098
Assertion : Aniline is a weaker base than cyclohexyl amine. Reason : Aniline undergoes halogenation even in the absence of a catalyst.
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:
Aniline's resonance hybridization diminishes the availability of nitrogen's lone pair for protonation, stemming from conjugation with the aromatic benzene ring. Unlike aniline, cyclohexylamine lacks resonance, rendering its nitrogen lone pair more accessible for protonation, making it a stronger base. Given reason is also a correct statement. So the option (2) is correct.
CHXII13:AMINES
324099
Which among the following amines has lowest \(\mathrm{pK}_{\mathrm{b}}\) values?
\(\left(\mathrm{CH}_{3} \mathrm{CH}_{2}\right)_{2} \mathrm{NH}\) is secondary amine which is strong base and has lowest \(\mathrm{pK}_{\mathrm{b}}\) value.
MHTCET - 2021
CHXII13:AMINES
324100 Arrange the above compounds in the decreasing order of their basic strength.
1 \(2>1>3\)
2 \(1>2>3\)
3 \(3>1>2\)
4 \(3>2>1\)
Explanation:
In p-nitroaniline (2) due to -I effect of \(-\mathrm{NO}_{2}\) group the lone pair of electrons on nitrogen is not available for donation and hence, it will be least basic while in o -methylaniline (3) due to +I effect of \(-\mathrm{CH}_{3}\) group there is high electron density on nitrogen hence, will be most basic among the given options. \(\therefore\) Order of basicity will be
CHXII13:AMINES
324101
Which of the following conjugate bases is stabilized to greater extent due to solvation of ammonia and amines?
1 \(\mathrm{R}_{3} \mathrm{NH}^{+}\)
2 \(\mathrm{RNH}_{3}^{+}\)
3 \(\mathrm{NH}_{4}^{+}\)
4 \(\mathrm{R}_{2} \mathrm{NH}_{2}^{+}\)
Explanation:
\(\mathrm{NH}_{4}^{\oplus}\) is best stabilized by solution while the stabalization by solvation is very poor in \({{\text{R}}_3}{\text{N}}{{\text{H}}^ \oplus }\) Order of stabilization: \(\mathrm{NH}_{4}^{\oplus}>>\mathrm{R}-\mathrm{NH}_{3}^{\oplus}>\mathrm{R}_{2} \mathrm{NH}_{2}^{\oplus}>\mathrm{R}_{3} \mathrm{NH}^{\oplus}\)
324097
Suitable explanation for the order of basic character \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N} < \left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\) is :
1 Steric hindrance by bulky methyl group
2 Higher volatility of \(3^{\circ}\) amine
3 Decreased capacity for H-bond formation with \(\mathrm{H}_{2} \mathrm{O}\)
4 Decreased electron-density at \(\mathrm{N}\) atom
Explanation:
Due to steric hindrance by methyl group.
CHXII13:AMINES
324098
Assertion : Aniline is a weaker base than cyclohexyl amine. Reason : Aniline undergoes halogenation even in the absence of a catalyst.
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:
Aniline's resonance hybridization diminishes the availability of nitrogen's lone pair for protonation, stemming from conjugation with the aromatic benzene ring. Unlike aniline, cyclohexylamine lacks resonance, rendering its nitrogen lone pair more accessible for protonation, making it a stronger base. Given reason is also a correct statement. So the option (2) is correct.
CHXII13:AMINES
324099
Which among the following amines has lowest \(\mathrm{pK}_{\mathrm{b}}\) values?
\(\left(\mathrm{CH}_{3} \mathrm{CH}_{2}\right)_{2} \mathrm{NH}\) is secondary amine which is strong base and has lowest \(\mathrm{pK}_{\mathrm{b}}\) value.
MHTCET - 2021
CHXII13:AMINES
324100 Arrange the above compounds in the decreasing order of their basic strength.
1 \(2>1>3\)
2 \(1>2>3\)
3 \(3>1>2\)
4 \(3>2>1\)
Explanation:
In p-nitroaniline (2) due to -I effect of \(-\mathrm{NO}_{2}\) group the lone pair of electrons on nitrogen is not available for donation and hence, it will be least basic while in o -methylaniline (3) due to +I effect of \(-\mathrm{CH}_{3}\) group there is high electron density on nitrogen hence, will be most basic among the given options. \(\therefore\) Order of basicity will be
CHXII13:AMINES
324101
Which of the following conjugate bases is stabilized to greater extent due to solvation of ammonia and amines?
1 \(\mathrm{R}_{3} \mathrm{NH}^{+}\)
2 \(\mathrm{RNH}_{3}^{+}\)
3 \(\mathrm{NH}_{4}^{+}\)
4 \(\mathrm{R}_{2} \mathrm{NH}_{2}^{+}\)
Explanation:
\(\mathrm{NH}_{4}^{\oplus}\) is best stabilized by solution while the stabalization by solvation is very poor in \({{\text{R}}_3}{\text{N}}{{\text{H}}^ \oplus }\) Order of stabilization: \(\mathrm{NH}_{4}^{\oplus}>>\mathrm{R}-\mathrm{NH}_{3}^{\oplus}>\mathrm{R}_{2} \mathrm{NH}_{2}^{\oplus}>\mathrm{R}_{3} \mathrm{NH}^{\oplus}\)
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CHXII13:AMINES
324097
Suitable explanation for the order of basic character \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N} < \left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\) is :
1 Steric hindrance by bulky methyl group
2 Higher volatility of \(3^{\circ}\) amine
3 Decreased capacity for H-bond formation with \(\mathrm{H}_{2} \mathrm{O}\)
4 Decreased electron-density at \(\mathrm{N}\) atom
Explanation:
Due to steric hindrance by methyl group.
CHXII13:AMINES
324098
Assertion : Aniline is a weaker base than cyclohexyl amine. Reason : Aniline undergoes halogenation even in the absence of a catalyst.
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:
Aniline's resonance hybridization diminishes the availability of nitrogen's lone pair for protonation, stemming from conjugation with the aromatic benzene ring. Unlike aniline, cyclohexylamine lacks resonance, rendering its nitrogen lone pair more accessible for protonation, making it a stronger base. Given reason is also a correct statement. So the option (2) is correct.
CHXII13:AMINES
324099
Which among the following amines has lowest \(\mathrm{pK}_{\mathrm{b}}\) values?
\(\left(\mathrm{CH}_{3} \mathrm{CH}_{2}\right)_{2} \mathrm{NH}\) is secondary amine which is strong base and has lowest \(\mathrm{pK}_{\mathrm{b}}\) value.
MHTCET - 2021
CHXII13:AMINES
324100 Arrange the above compounds in the decreasing order of their basic strength.
1 \(2>1>3\)
2 \(1>2>3\)
3 \(3>1>2\)
4 \(3>2>1\)
Explanation:
In p-nitroaniline (2) due to -I effect of \(-\mathrm{NO}_{2}\) group the lone pair of electrons on nitrogen is not available for donation and hence, it will be least basic while in o -methylaniline (3) due to +I effect of \(-\mathrm{CH}_{3}\) group there is high electron density on nitrogen hence, will be most basic among the given options. \(\therefore\) Order of basicity will be
CHXII13:AMINES
324101
Which of the following conjugate bases is stabilized to greater extent due to solvation of ammonia and amines?
1 \(\mathrm{R}_{3} \mathrm{NH}^{+}\)
2 \(\mathrm{RNH}_{3}^{+}\)
3 \(\mathrm{NH}_{4}^{+}\)
4 \(\mathrm{R}_{2} \mathrm{NH}_{2}^{+}\)
Explanation:
\(\mathrm{NH}_{4}^{\oplus}\) is best stabilized by solution while the stabalization by solvation is very poor in \({{\text{R}}_3}{\text{N}}{{\text{H}}^ \oplus }\) Order of stabilization: \(\mathrm{NH}_{4}^{\oplus}>>\mathrm{R}-\mathrm{NH}_{3}^{\oplus}>\mathrm{R}_{2} \mathrm{NH}_{2}^{\oplus}>\mathrm{R}_{3} \mathrm{NH}^{\oplus}\)
324097
Suitable explanation for the order of basic character \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N} < \left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\) is :
1 Steric hindrance by bulky methyl group
2 Higher volatility of \(3^{\circ}\) amine
3 Decreased capacity for H-bond formation with \(\mathrm{H}_{2} \mathrm{O}\)
4 Decreased electron-density at \(\mathrm{N}\) atom
Explanation:
Due to steric hindrance by methyl group.
CHXII13:AMINES
324098
Assertion : Aniline is a weaker base than cyclohexyl amine. Reason : Aniline undergoes halogenation even in the absence of a catalyst.
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:
Aniline's resonance hybridization diminishes the availability of nitrogen's lone pair for protonation, stemming from conjugation with the aromatic benzene ring. Unlike aniline, cyclohexylamine lacks resonance, rendering its nitrogen lone pair more accessible for protonation, making it a stronger base. Given reason is also a correct statement. So the option (2) is correct.
CHXII13:AMINES
324099
Which among the following amines has lowest \(\mathrm{pK}_{\mathrm{b}}\) values?
\(\left(\mathrm{CH}_{3} \mathrm{CH}_{2}\right)_{2} \mathrm{NH}\) is secondary amine which is strong base and has lowest \(\mathrm{pK}_{\mathrm{b}}\) value.
MHTCET - 2021
CHXII13:AMINES
324100 Arrange the above compounds in the decreasing order of their basic strength.
1 \(2>1>3\)
2 \(1>2>3\)
3 \(3>1>2\)
4 \(3>2>1\)
Explanation:
In p-nitroaniline (2) due to -I effect of \(-\mathrm{NO}_{2}\) group the lone pair of electrons on nitrogen is not available for donation and hence, it will be least basic while in o -methylaniline (3) due to +I effect of \(-\mathrm{CH}_{3}\) group there is high electron density on nitrogen hence, will be most basic among the given options. \(\therefore\) Order of basicity will be
CHXII13:AMINES
324101
Which of the following conjugate bases is stabilized to greater extent due to solvation of ammonia and amines?
1 \(\mathrm{R}_{3} \mathrm{NH}^{+}\)
2 \(\mathrm{RNH}_{3}^{+}\)
3 \(\mathrm{NH}_{4}^{+}\)
4 \(\mathrm{R}_{2} \mathrm{NH}_{2}^{+}\)
Explanation:
\(\mathrm{NH}_{4}^{\oplus}\) is best stabilized by solution while the stabalization by solvation is very poor in \({{\text{R}}_3}{\text{N}}{{\text{H}}^ \oplus }\) Order of stabilization: \(\mathrm{NH}_{4}^{\oplus}>>\mathrm{R}-\mathrm{NH}_{3}^{\oplus}>\mathrm{R}_{2} \mathrm{NH}_{2}^{\oplus}>\mathrm{R}_{3} \mathrm{NH}^{\oplus}\)
324097
Suitable explanation for the order of basic character \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N} < \left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\) is :
1 Steric hindrance by bulky methyl group
2 Higher volatility of \(3^{\circ}\) amine
3 Decreased capacity for H-bond formation with \(\mathrm{H}_{2} \mathrm{O}\)
4 Decreased electron-density at \(\mathrm{N}\) atom
Explanation:
Due to steric hindrance by methyl group.
CHXII13:AMINES
324098
Assertion : Aniline is a weaker base than cyclohexyl amine. Reason : Aniline undergoes halogenation even in the absence of a catalyst.
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:
Aniline's resonance hybridization diminishes the availability of nitrogen's lone pair for protonation, stemming from conjugation with the aromatic benzene ring. Unlike aniline, cyclohexylamine lacks resonance, rendering its nitrogen lone pair more accessible for protonation, making it a stronger base. Given reason is also a correct statement. So the option (2) is correct.
CHXII13:AMINES
324099
Which among the following amines has lowest \(\mathrm{pK}_{\mathrm{b}}\) values?
\(\left(\mathrm{CH}_{3} \mathrm{CH}_{2}\right)_{2} \mathrm{NH}\) is secondary amine which is strong base and has lowest \(\mathrm{pK}_{\mathrm{b}}\) value.
MHTCET - 2021
CHXII13:AMINES
324100 Arrange the above compounds in the decreasing order of their basic strength.
1 \(2>1>3\)
2 \(1>2>3\)
3 \(3>1>2\)
4 \(3>2>1\)
Explanation:
In p-nitroaniline (2) due to -I effect of \(-\mathrm{NO}_{2}\) group the lone pair of electrons on nitrogen is not available for donation and hence, it will be least basic while in o -methylaniline (3) due to +I effect of \(-\mathrm{CH}_{3}\) group there is high electron density on nitrogen hence, will be most basic among the given options. \(\therefore\) Order of basicity will be
CHXII13:AMINES
324101
Which of the following conjugate bases is stabilized to greater extent due to solvation of ammonia and amines?
1 \(\mathrm{R}_{3} \mathrm{NH}^{+}\)
2 \(\mathrm{RNH}_{3}^{+}\)
3 \(\mathrm{NH}_{4}^{+}\)
4 \(\mathrm{R}_{2} \mathrm{NH}_{2}^{+}\)
Explanation:
\(\mathrm{NH}_{4}^{\oplus}\) is best stabilized by solution while the stabalization by solvation is very poor in \({{\text{R}}_3}{\text{N}}{{\text{H}}^ \oplus }\) Order of stabilization: \(\mathrm{NH}_{4}^{\oplus}>>\mathrm{R}-\mathrm{NH}_{3}^{\oplus}>\mathrm{R}_{2} \mathrm{NH}_{2}^{\oplus}>\mathrm{R}_{3} \mathrm{NH}^{\oplus}\)
