231444
The most basic compound in the following is
1 $\mathrm{NH}_{3}$
2 $\mathrm{CH}_{3} \mathrm{NH}_{2}$
3 $\mathrm{HN}\left(\mathrm{CH}_{3}\right)_{2}$
4 $\mathrm{N}\left(\mathrm{CH}_{3}\right)_{2}$
Explanation:
$+\mathrm{I}$ effect increase the basicity of $\mathrm{N}$ because $+\mathrm{I}$ effect increase the electron density at $\mathrm{N}$ and the lone pair electron is easily donate. Hence, $\mathrm{N}\left(\mathrm{CH}_{3}\right)_{2}$ is most basic compound. But in aqueous solution $\mathrm{HN}\left(\mathrm{CH}_{3}\right)_{2}$ is most basic.
J and K CET-(2008)
GENERAL ORGANIC CHEMISTRY
231445
Which of the following compound will have the smallest $\mathbf{p K}_{\mathrm{a}}$ value?
1 Benzoic acid
2 Formic acid
3 Acetic acid
4 Phenylacetic acid
Explanation:
The strongest acid has the smallest $\mathrm{pK}_{\mathrm{a}}$ value and weaker acid has largest. Acidity increase by $-\mathrm{I}$ effect and delocalization of electron. $+\mathrm{I}$ effect decrease the acidity. Hence the formic acid is strongest acid and lowest $\mathrm{pK}_{\mathrm{a}}$ value because it has no. $+\mathrm{I}$ effect. Hence, ' $\mathrm{b}$ ' option is correct. The increasing order of $\mathrm{pK}_{\mathrm{a}}$ value isFormic acid $<$ benzoic acid $<$ Acetic acid $<$ Phenyl acetic acid
J and K CET-(2010)
GENERAL ORGANIC CHEMISTRY
231447
Dichloroacetic acid is a stronger acid than acetic acid. This is due to occurrence of
1 mesomeric effect
2 hyperconjugation
3 inductive effect
4 steric effect
Explanation:
Dichloro acetic acid is stronger acid than the acetic acid due to inductive effect. The -I-effect of chlorine attracts the electrons towards itself. Therefore, acidity will increases. Hence, 'c' option is correct.
J and K CET-(2008)
GENERAL ORGANIC CHEMISTRY
231459
Which of the following is an electrophile?
1 $\mathrm{H}_{2} \mathrm{O}$
2 $\mathrm{SO}_{3}$
3 $\mathrm{NH}_{3}$
4 $\mathrm{ROR}$
Explanation:
$\mathrm{SO}_{3}$ is a electrophile because it has a vacant d-orbital, which accept the electron by nucleophile. Hence, 'b' option is correct.
J and K CET-(2005)
GENERAL ORGANIC CHEMISTRY
231460
The presence of the chlorine atom on benzene ring makes the second substituent enter at a position
1 Ortho
2 Meta
3 Para
4 Ortho/para
Explanation:
Chlorine is a o, p-director, when chlorine on benzene ring maker the second substituent enter. Because $\mathrm{Cl}$ atom push the outer orbital electron by $+\mathrm{m}$ effect. Hence, 'd' option is correct.
231444
The most basic compound in the following is
1 $\mathrm{NH}_{3}$
2 $\mathrm{CH}_{3} \mathrm{NH}_{2}$
3 $\mathrm{HN}\left(\mathrm{CH}_{3}\right)_{2}$
4 $\mathrm{N}\left(\mathrm{CH}_{3}\right)_{2}$
Explanation:
$+\mathrm{I}$ effect increase the basicity of $\mathrm{N}$ because $+\mathrm{I}$ effect increase the electron density at $\mathrm{N}$ and the lone pair electron is easily donate. Hence, $\mathrm{N}\left(\mathrm{CH}_{3}\right)_{2}$ is most basic compound. But in aqueous solution $\mathrm{HN}\left(\mathrm{CH}_{3}\right)_{2}$ is most basic.
J and K CET-(2008)
GENERAL ORGANIC CHEMISTRY
231445
Which of the following compound will have the smallest $\mathbf{p K}_{\mathrm{a}}$ value?
1 Benzoic acid
2 Formic acid
3 Acetic acid
4 Phenylacetic acid
Explanation:
The strongest acid has the smallest $\mathrm{pK}_{\mathrm{a}}$ value and weaker acid has largest. Acidity increase by $-\mathrm{I}$ effect and delocalization of electron. $+\mathrm{I}$ effect decrease the acidity. Hence the formic acid is strongest acid and lowest $\mathrm{pK}_{\mathrm{a}}$ value because it has no. $+\mathrm{I}$ effect. Hence, ' $\mathrm{b}$ ' option is correct. The increasing order of $\mathrm{pK}_{\mathrm{a}}$ value isFormic acid $<$ benzoic acid $<$ Acetic acid $<$ Phenyl acetic acid
J and K CET-(2010)
GENERAL ORGANIC CHEMISTRY
231447
Dichloroacetic acid is a stronger acid than acetic acid. This is due to occurrence of
1 mesomeric effect
2 hyperconjugation
3 inductive effect
4 steric effect
Explanation:
Dichloro acetic acid is stronger acid than the acetic acid due to inductive effect. The -I-effect of chlorine attracts the electrons towards itself. Therefore, acidity will increases. Hence, 'c' option is correct.
J and K CET-(2008)
GENERAL ORGANIC CHEMISTRY
231459
Which of the following is an electrophile?
1 $\mathrm{H}_{2} \mathrm{O}$
2 $\mathrm{SO}_{3}$
3 $\mathrm{NH}_{3}$
4 $\mathrm{ROR}$
Explanation:
$\mathrm{SO}_{3}$ is a electrophile because it has a vacant d-orbital, which accept the electron by nucleophile. Hence, 'b' option is correct.
J and K CET-(2005)
GENERAL ORGANIC CHEMISTRY
231460
The presence of the chlorine atom on benzene ring makes the second substituent enter at a position
1 Ortho
2 Meta
3 Para
4 Ortho/para
Explanation:
Chlorine is a o, p-director, when chlorine on benzene ring maker the second substituent enter. Because $\mathrm{Cl}$ atom push the outer orbital electron by $+\mathrm{m}$ effect. Hence, 'd' option is correct.
231444
The most basic compound in the following is
1 $\mathrm{NH}_{3}$
2 $\mathrm{CH}_{3} \mathrm{NH}_{2}$
3 $\mathrm{HN}\left(\mathrm{CH}_{3}\right)_{2}$
4 $\mathrm{N}\left(\mathrm{CH}_{3}\right)_{2}$
Explanation:
$+\mathrm{I}$ effect increase the basicity of $\mathrm{N}$ because $+\mathrm{I}$ effect increase the electron density at $\mathrm{N}$ and the lone pair electron is easily donate. Hence, $\mathrm{N}\left(\mathrm{CH}_{3}\right)_{2}$ is most basic compound. But in aqueous solution $\mathrm{HN}\left(\mathrm{CH}_{3}\right)_{2}$ is most basic.
J and K CET-(2008)
GENERAL ORGANIC CHEMISTRY
231445
Which of the following compound will have the smallest $\mathbf{p K}_{\mathrm{a}}$ value?
1 Benzoic acid
2 Formic acid
3 Acetic acid
4 Phenylacetic acid
Explanation:
The strongest acid has the smallest $\mathrm{pK}_{\mathrm{a}}$ value and weaker acid has largest. Acidity increase by $-\mathrm{I}$ effect and delocalization of electron. $+\mathrm{I}$ effect decrease the acidity. Hence the formic acid is strongest acid and lowest $\mathrm{pK}_{\mathrm{a}}$ value because it has no. $+\mathrm{I}$ effect. Hence, ' $\mathrm{b}$ ' option is correct. The increasing order of $\mathrm{pK}_{\mathrm{a}}$ value isFormic acid $<$ benzoic acid $<$ Acetic acid $<$ Phenyl acetic acid
J and K CET-(2010)
GENERAL ORGANIC CHEMISTRY
231447
Dichloroacetic acid is a stronger acid than acetic acid. This is due to occurrence of
1 mesomeric effect
2 hyperconjugation
3 inductive effect
4 steric effect
Explanation:
Dichloro acetic acid is stronger acid than the acetic acid due to inductive effect. The -I-effect of chlorine attracts the electrons towards itself. Therefore, acidity will increases. Hence, 'c' option is correct.
J and K CET-(2008)
GENERAL ORGANIC CHEMISTRY
231459
Which of the following is an electrophile?
1 $\mathrm{H}_{2} \mathrm{O}$
2 $\mathrm{SO}_{3}$
3 $\mathrm{NH}_{3}$
4 $\mathrm{ROR}$
Explanation:
$\mathrm{SO}_{3}$ is a electrophile because it has a vacant d-orbital, which accept the electron by nucleophile. Hence, 'b' option is correct.
J and K CET-(2005)
GENERAL ORGANIC CHEMISTRY
231460
The presence of the chlorine atom on benzene ring makes the second substituent enter at a position
1 Ortho
2 Meta
3 Para
4 Ortho/para
Explanation:
Chlorine is a o, p-director, when chlorine on benzene ring maker the second substituent enter. Because $\mathrm{Cl}$ atom push the outer orbital electron by $+\mathrm{m}$ effect. Hence, 'd' option is correct.
231444
The most basic compound in the following is
1 $\mathrm{NH}_{3}$
2 $\mathrm{CH}_{3} \mathrm{NH}_{2}$
3 $\mathrm{HN}\left(\mathrm{CH}_{3}\right)_{2}$
4 $\mathrm{N}\left(\mathrm{CH}_{3}\right)_{2}$
Explanation:
$+\mathrm{I}$ effect increase the basicity of $\mathrm{N}$ because $+\mathrm{I}$ effect increase the electron density at $\mathrm{N}$ and the lone pair electron is easily donate. Hence, $\mathrm{N}\left(\mathrm{CH}_{3}\right)_{2}$ is most basic compound. But in aqueous solution $\mathrm{HN}\left(\mathrm{CH}_{3}\right)_{2}$ is most basic.
J and K CET-(2008)
GENERAL ORGANIC CHEMISTRY
231445
Which of the following compound will have the smallest $\mathbf{p K}_{\mathrm{a}}$ value?
1 Benzoic acid
2 Formic acid
3 Acetic acid
4 Phenylacetic acid
Explanation:
The strongest acid has the smallest $\mathrm{pK}_{\mathrm{a}}$ value and weaker acid has largest. Acidity increase by $-\mathrm{I}$ effect and delocalization of electron. $+\mathrm{I}$ effect decrease the acidity. Hence the formic acid is strongest acid and lowest $\mathrm{pK}_{\mathrm{a}}$ value because it has no. $+\mathrm{I}$ effect. Hence, ' $\mathrm{b}$ ' option is correct. The increasing order of $\mathrm{pK}_{\mathrm{a}}$ value isFormic acid $<$ benzoic acid $<$ Acetic acid $<$ Phenyl acetic acid
J and K CET-(2010)
GENERAL ORGANIC CHEMISTRY
231447
Dichloroacetic acid is a stronger acid than acetic acid. This is due to occurrence of
1 mesomeric effect
2 hyperconjugation
3 inductive effect
4 steric effect
Explanation:
Dichloro acetic acid is stronger acid than the acetic acid due to inductive effect. The -I-effect of chlorine attracts the electrons towards itself. Therefore, acidity will increases. Hence, 'c' option is correct.
J and K CET-(2008)
GENERAL ORGANIC CHEMISTRY
231459
Which of the following is an electrophile?
1 $\mathrm{H}_{2} \mathrm{O}$
2 $\mathrm{SO}_{3}$
3 $\mathrm{NH}_{3}$
4 $\mathrm{ROR}$
Explanation:
$\mathrm{SO}_{3}$ is a electrophile because it has a vacant d-orbital, which accept the electron by nucleophile. Hence, 'b' option is correct.
J and K CET-(2005)
GENERAL ORGANIC CHEMISTRY
231460
The presence of the chlorine atom on benzene ring makes the second substituent enter at a position
1 Ortho
2 Meta
3 Para
4 Ortho/para
Explanation:
Chlorine is a o, p-director, when chlorine on benzene ring maker the second substituent enter. Because $\mathrm{Cl}$ atom push the outer orbital electron by $+\mathrm{m}$ effect. Hence, 'd' option is correct.
231444
The most basic compound in the following is
1 $\mathrm{NH}_{3}$
2 $\mathrm{CH}_{3} \mathrm{NH}_{2}$
3 $\mathrm{HN}\left(\mathrm{CH}_{3}\right)_{2}$
4 $\mathrm{N}\left(\mathrm{CH}_{3}\right)_{2}$
Explanation:
$+\mathrm{I}$ effect increase the basicity of $\mathrm{N}$ because $+\mathrm{I}$ effect increase the electron density at $\mathrm{N}$ and the lone pair electron is easily donate. Hence, $\mathrm{N}\left(\mathrm{CH}_{3}\right)_{2}$ is most basic compound. But in aqueous solution $\mathrm{HN}\left(\mathrm{CH}_{3}\right)_{2}$ is most basic.
J and K CET-(2008)
GENERAL ORGANIC CHEMISTRY
231445
Which of the following compound will have the smallest $\mathbf{p K}_{\mathrm{a}}$ value?
1 Benzoic acid
2 Formic acid
3 Acetic acid
4 Phenylacetic acid
Explanation:
The strongest acid has the smallest $\mathrm{pK}_{\mathrm{a}}$ value and weaker acid has largest. Acidity increase by $-\mathrm{I}$ effect and delocalization of electron. $+\mathrm{I}$ effect decrease the acidity. Hence the formic acid is strongest acid and lowest $\mathrm{pK}_{\mathrm{a}}$ value because it has no. $+\mathrm{I}$ effect. Hence, ' $\mathrm{b}$ ' option is correct. The increasing order of $\mathrm{pK}_{\mathrm{a}}$ value isFormic acid $<$ benzoic acid $<$ Acetic acid $<$ Phenyl acetic acid
J and K CET-(2010)
GENERAL ORGANIC CHEMISTRY
231447
Dichloroacetic acid is a stronger acid than acetic acid. This is due to occurrence of
1 mesomeric effect
2 hyperconjugation
3 inductive effect
4 steric effect
Explanation:
Dichloro acetic acid is stronger acid than the acetic acid due to inductive effect. The -I-effect of chlorine attracts the electrons towards itself. Therefore, acidity will increases. Hence, 'c' option is correct.
J and K CET-(2008)
GENERAL ORGANIC CHEMISTRY
231459
Which of the following is an electrophile?
1 $\mathrm{H}_{2} \mathrm{O}$
2 $\mathrm{SO}_{3}$
3 $\mathrm{NH}_{3}$
4 $\mathrm{ROR}$
Explanation:
$\mathrm{SO}_{3}$ is a electrophile because it has a vacant d-orbital, which accept the electron by nucleophile. Hence, 'b' option is correct.
J and K CET-(2005)
GENERAL ORGANIC CHEMISTRY
231460
The presence of the chlorine atom on benzene ring makes the second substituent enter at a position
1 Ortho
2 Meta
3 Para
4 Ortho/para
Explanation:
Chlorine is a o, p-director, when chlorine on benzene ring maker the second substituent enter. Because $\mathrm{Cl}$ atom push the outer orbital electron by $+\mathrm{m}$ effect. Hence, 'd' option is correct.
