Exp: 4-ethylnitrobenzene reacts with $\mathrm{Br}_{2}$ in presence of UV light then the free radical halogenation reaction takes place in benzylic carbon of the compound.
Kerala-CEE-29.08.2021
AMINES
278796 In the above chemical reaction, intermediate $X$ and reagent/condition $A$ are
1
2
3
4
Explanation:
Aniline is converted into benzene diazonium chloride by diazotisation reaction. Benzene diazonium chloride is converted into phenol when it reacts with water and then heat up the mixture.
JEE Main 2021
AMINES
278797
1
2
3
4
Explanation:
Benzene diazonium chloride reacts with $\mathrm{N}, \mathrm{N}$ dimethylaniline and show coupling reactions.
JEE Main 2021
AMINES
278802
The increasing order of $\mathrm{pK}_{\mathrm{b}}$ values of the following compounds is
1 II $<$ IV $<$ III $<$ I
2 I $<$ II $<$ IV $<$ III
3 II $<$ I $<$ III $<$ IV
4 I $<$ II $<$ III $<$ IV
Explanation:
$\mathrm{pK}_{\mathrm{b}} \propto \frac{1}{\text { Basic strength }}$ Basic strength $\propto \frac{+\mathrm{M}|+\mathrm{H}|+\mathrm{I}}{-\mathrm{M}|-\mathrm{H}|-\mathrm{I}}$
In case of (I) \(-\mathrm{OCH}_3\) group is \(\mathrm{O}\) and \(\mathrm{P}\) directing so it increases the basicity while in case of (IV) \(-\mathrm{OH}\) group is also \(\mathrm{O}\) and \(\mathrm{P}\) directing but \(-\mathrm{OH}\) does not increases the electron density on \(-\mathrm{N}\left(\mathrm{CH}_3\right)_2\). So, its basicity is less. In case of (III) - \(\mathrm{CN}\) group is m-directing so it decrease the electron density on \(-\mathrm{N}\left(\mathrm{CH}_3\right)_2\) Hence, its basicity is less.
Order of \(\mathrm{pK}_{\mathrm{b}}\) value:- (I) \(<\) (II) \(<\) (IV) \(<\) (III)
Exp: 4-ethylnitrobenzene reacts with $\mathrm{Br}_{2}$ in presence of UV light then the free radical halogenation reaction takes place in benzylic carbon of the compound.
Kerala-CEE-29.08.2021
AMINES
278796 In the above chemical reaction, intermediate $X$ and reagent/condition $A$ are
1
2
3
4
Explanation:
Aniline is converted into benzene diazonium chloride by diazotisation reaction. Benzene diazonium chloride is converted into phenol when it reacts with water and then heat up the mixture.
JEE Main 2021
AMINES
278797
1
2
3
4
Explanation:
Benzene diazonium chloride reacts with $\mathrm{N}, \mathrm{N}$ dimethylaniline and show coupling reactions.
JEE Main 2021
AMINES
278802
The increasing order of $\mathrm{pK}_{\mathrm{b}}$ values of the following compounds is
1 II $<$ IV $<$ III $<$ I
2 I $<$ II $<$ IV $<$ III
3 II $<$ I $<$ III $<$ IV
4 I $<$ II $<$ III $<$ IV
Explanation:
$\mathrm{pK}_{\mathrm{b}} \propto \frac{1}{\text { Basic strength }}$ Basic strength $\propto \frac{+\mathrm{M}|+\mathrm{H}|+\mathrm{I}}{-\mathrm{M}|-\mathrm{H}|-\mathrm{I}}$
In case of (I) \(-\mathrm{OCH}_3\) group is \(\mathrm{O}\) and \(\mathrm{P}\) directing so it increases the basicity while in case of (IV) \(-\mathrm{OH}\) group is also \(\mathrm{O}\) and \(\mathrm{P}\) directing but \(-\mathrm{OH}\) does not increases the electron density on \(-\mathrm{N}\left(\mathrm{CH}_3\right)_2\). So, its basicity is less. In case of (III) - \(\mathrm{CN}\) group is m-directing so it decrease the electron density on \(-\mathrm{N}\left(\mathrm{CH}_3\right)_2\) Hence, its basicity is less.
Order of \(\mathrm{pK}_{\mathrm{b}}\) value:- (I) \(<\) (II) \(<\) (IV) \(<\) (III)
NEET Test Series from KOTA - 10 Papers In MS WORD
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AMINES
278792 A. The Compound A (major product) is
1
2
3
4
Explanation:
Exp: 4-ethylnitrobenzene reacts with $\mathrm{Br}_{2}$ in presence of UV light then the free radical halogenation reaction takes place in benzylic carbon of the compound.
Kerala-CEE-29.08.2021
AMINES
278796 In the above chemical reaction, intermediate $X$ and reagent/condition $A$ are
1
2
3
4
Explanation:
Aniline is converted into benzene diazonium chloride by diazotisation reaction. Benzene diazonium chloride is converted into phenol when it reacts with water and then heat up the mixture.
JEE Main 2021
AMINES
278797
1
2
3
4
Explanation:
Benzene diazonium chloride reacts with $\mathrm{N}, \mathrm{N}$ dimethylaniline and show coupling reactions.
JEE Main 2021
AMINES
278802
The increasing order of $\mathrm{pK}_{\mathrm{b}}$ values of the following compounds is
1 II $<$ IV $<$ III $<$ I
2 I $<$ II $<$ IV $<$ III
3 II $<$ I $<$ III $<$ IV
4 I $<$ II $<$ III $<$ IV
Explanation:
$\mathrm{pK}_{\mathrm{b}} \propto \frac{1}{\text { Basic strength }}$ Basic strength $\propto \frac{+\mathrm{M}|+\mathrm{H}|+\mathrm{I}}{-\mathrm{M}|-\mathrm{H}|-\mathrm{I}}$
In case of (I) \(-\mathrm{OCH}_3\) group is \(\mathrm{O}\) and \(\mathrm{P}\) directing so it increases the basicity while in case of (IV) \(-\mathrm{OH}\) group is also \(\mathrm{O}\) and \(\mathrm{P}\) directing but \(-\mathrm{OH}\) does not increases the electron density on \(-\mathrm{N}\left(\mathrm{CH}_3\right)_2\). So, its basicity is less. In case of (III) - \(\mathrm{CN}\) group is m-directing so it decrease the electron density on \(-\mathrm{N}\left(\mathrm{CH}_3\right)_2\) Hence, its basicity is less.
Order of \(\mathrm{pK}_{\mathrm{b}}\) value:- (I) \(<\) (II) \(<\) (IV) \(<\) (III)
Exp: 4-ethylnitrobenzene reacts with $\mathrm{Br}_{2}$ in presence of UV light then the free radical halogenation reaction takes place in benzylic carbon of the compound.
Kerala-CEE-29.08.2021
AMINES
278796 In the above chemical reaction, intermediate $X$ and reagent/condition $A$ are
1
2
3
4
Explanation:
Aniline is converted into benzene diazonium chloride by diazotisation reaction. Benzene diazonium chloride is converted into phenol when it reacts with water and then heat up the mixture.
JEE Main 2021
AMINES
278797
1
2
3
4
Explanation:
Benzene diazonium chloride reacts with $\mathrm{N}, \mathrm{N}$ dimethylaniline and show coupling reactions.
JEE Main 2021
AMINES
278802
The increasing order of $\mathrm{pK}_{\mathrm{b}}$ values of the following compounds is
1 II $<$ IV $<$ III $<$ I
2 I $<$ II $<$ IV $<$ III
3 II $<$ I $<$ III $<$ IV
4 I $<$ II $<$ III $<$ IV
Explanation:
$\mathrm{pK}_{\mathrm{b}} \propto \frac{1}{\text { Basic strength }}$ Basic strength $\propto \frac{+\mathrm{M}|+\mathrm{H}|+\mathrm{I}}{-\mathrm{M}|-\mathrm{H}|-\mathrm{I}}$
In case of (I) \(-\mathrm{OCH}_3\) group is \(\mathrm{O}\) and \(\mathrm{P}\) directing so it increases the basicity while in case of (IV) \(-\mathrm{OH}\) group is also \(\mathrm{O}\) and \(\mathrm{P}\) directing but \(-\mathrm{OH}\) does not increases the electron density on \(-\mathrm{N}\left(\mathrm{CH}_3\right)_2\). So, its basicity is less. In case of (III) - \(\mathrm{CN}\) group is m-directing so it decrease the electron density on \(-\mathrm{N}\left(\mathrm{CH}_3\right)_2\) Hence, its basicity is less.
Order of \(\mathrm{pK}_{\mathrm{b}}\) value:- (I) \(<\) (II) \(<\) (IV) \(<\) (III)
A. The Compound A (major product) is
