278791
The major products $A$ and $B$ formed in the following reaction sequence are
1
2
3
4
Explanation:
$1^{\text {st }}$ step is protection of aniline which decreases the nucleophilicity of benzene ring and therefore its reactivity also decreases. That why only monobromination product is formed.
JEE Main 2021
AMINES
278794
Which of the following reaction/s will not give p-aminoazobenzene?
1 B only
2 A and B
3 C only
4 A only
Explanation:
When aniline reacts with $\mathrm{HNO}_{2}$ it gives - When nitrobenzene reacts with sodium borohydride $\left(\mathrm{NaBH}_{4}\right)$, being a strong reducing agent $-\mathrm{NO}_{2}$ group gets converted into $-\mathrm{NH}_{2}$ group i.e,
Since, $\mathrm{OH}^{-}$has negative charge on it, it will act as a nucleophilic and will not react with aniline.
JEE Main 25-02-2021 Shift-I
AMINES
278798 In the chemical reactions given above $A$ and $B$ respectively are
1 $\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$
2 $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
3 $\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$
4 $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
Explanation:
Benzene diazonium chloride converted into benzene by the help of $\mathrm{H}_{3} \mathrm{PO}_{2}$ (A) and water. Further benzene undergoes friendel Craft Alkylation reaction and reacts with ethychloride $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$ (B) in presence of anhydrous $\mathrm{AlCl}_{3}$.
JEE Main 2021
AMINES
278803
Consider the following reaction :
The product ' $\mathrm{X}$ ' is used
1 in acid base titration as an indicator
2 in protein estimation as an alternative to ninhydrin
3 as food grade colourant
4 in laboratory test for phenols
Explanation:
Methyl Orange is used as an indicator in acid base titration reaction.
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AMINES
278791
The major products $A$ and $B$ formed in the following reaction sequence are
1
2
3
4
Explanation:
$1^{\text {st }}$ step is protection of aniline which decreases the nucleophilicity of benzene ring and therefore its reactivity also decreases. That why only monobromination product is formed.
JEE Main 2021
AMINES
278794
Which of the following reaction/s will not give p-aminoazobenzene?
1 B only
2 A and B
3 C only
4 A only
Explanation:
When aniline reacts with $\mathrm{HNO}_{2}$ it gives - When nitrobenzene reacts with sodium borohydride $\left(\mathrm{NaBH}_{4}\right)$, being a strong reducing agent $-\mathrm{NO}_{2}$ group gets converted into $-\mathrm{NH}_{2}$ group i.e,
Since, $\mathrm{OH}^{-}$has negative charge on it, it will act as a nucleophilic and will not react with aniline.
JEE Main 25-02-2021 Shift-I
AMINES
278798 In the chemical reactions given above $A$ and $B$ respectively are
1 $\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$
2 $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
3 $\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$
4 $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
Explanation:
Benzene diazonium chloride converted into benzene by the help of $\mathrm{H}_{3} \mathrm{PO}_{2}$ (A) and water. Further benzene undergoes friendel Craft Alkylation reaction and reacts with ethychloride $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$ (B) in presence of anhydrous $\mathrm{AlCl}_{3}$.
JEE Main 2021
AMINES
278803
Consider the following reaction :
The product ' $\mathrm{X}$ ' is used
1 in acid base titration as an indicator
2 in protein estimation as an alternative to ninhydrin
3 as food grade colourant
4 in laboratory test for phenols
Explanation:
Methyl Orange is used as an indicator in acid base titration reaction.
278791
The major products $A$ and $B$ formed in the following reaction sequence are
1
2
3
4
Explanation:
$1^{\text {st }}$ step is protection of aniline which decreases the nucleophilicity of benzene ring and therefore its reactivity also decreases. That why only monobromination product is formed.
JEE Main 2021
AMINES
278794
Which of the following reaction/s will not give p-aminoazobenzene?
1 B only
2 A and B
3 C only
4 A only
Explanation:
When aniline reacts with $\mathrm{HNO}_{2}$ it gives - When nitrobenzene reacts with sodium borohydride $\left(\mathrm{NaBH}_{4}\right)$, being a strong reducing agent $-\mathrm{NO}_{2}$ group gets converted into $-\mathrm{NH}_{2}$ group i.e,
Since, $\mathrm{OH}^{-}$has negative charge on it, it will act as a nucleophilic and will not react with aniline.
JEE Main 25-02-2021 Shift-I
AMINES
278798 In the chemical reactions given above $A$ and $B$ respectively are
1 $\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$
2 $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
3 $\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$
4 $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
Explanation:
Benzene diazonium chloride converted into benzene by the help of $\mathrm{H}_{3} \mathrm{PO}_{2}$ (A) and water. Further benzene undergoes friendel Craft Alkylation reaction and reacts with ethychloride $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$ (B) in presence of anhydrous $\mathrm{AlCl}_{3}$.
JEE Main 2021
AMINES
278803
Consider the following reaction :
The product ' $\mathrm{X}$ ' is used
1 in acid base titration as an indicator
2 in protein estimation as an alternative to ninhydrin
3 as food grade colourant
4 in laboratory test for phenols
Explanation:
Methyl Orange is used as an indicator in acid base titration reaction.
278791
The major products $A$ and $B$ formed in the following reaction sequence are
1
2
3
4
Explanation:
$1^{\text {st }}$ step is protection of aniline which decreases the nucleophilicity of benzene ring and therefore its reactivity also decreases. That why only monobromination product is formed.
JEE Main 2021
AMINES
278794
Which of the following reaction/s will not give p-aminoazobenzene?
1 B only
2 A and B
3 C only
4 A only
Explanation:
When aniline reacts with $\mathrm{HNO}_{2}$ it gives - When nitrobenzene reacts with sodium borohydride $\left(\mathrm{NaBH}_{4}\right)$, being a strong reducing agent $-\mathrm{NO}_{2}$ group gets converted into $-\mathrm{NH}_{2}$ group i.e,
Since, $\mathrm{OH}^{-}$has negative charge on it, it will act as a nucleophilic and will not react with aniline.
JEE Main 25-02-2021 Shift-I
AMINES
278798 In the chemical reactions given above $A$ and $B$ respectively are
1 $\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$
2 $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
3 $\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$
4 $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
Explanation:
Benzene diazonium chloride converted into benzene by the help of $\mathrm{H}_{3} \mathrm{PO}_{2}$ (A) and water. Further benzene undergoes friendel Craft Alkylation reaction and reacts with ethychloride $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$ (B) in presence of anhydrous $\mathrm{AlCl}_{3}$.
JEE Main 2021
AMINES
278803
Consider the following reaction :
The product ' $\mathrm{X}$ ' is used
1 in acid base titration as an indicator
2 in protein estimation as an alternative to ninhydrin
3 as food grade colourant
4 in laboratory test for phenols
Explanation:
Methyl Orange is used as an indicator in acid base titration reaction.
