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In the diazotisation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily to
- a)Supress the concentration of free aniline
- b)Supress the hydrolysis to phenol
- c)Ensure a stochiometric amount of nitrous acid
- d)Neutralise the base liberated
Correct answer is option 'B'. Can you explain this answer?
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In the diazotisation of aniline with sodium nitrite and hydrochloric a...
Explanation:
When aniline is diazotized with sodium nitrite and hydrochloric acid, the hydrochloric acid is used primarily to suppress the hydrolysis of the diazonium salt to phenol.
The breakdown of the diazonium salt to phenol is a competing reaction during diazotization. This is more pronounced in acidic conditions, and since hydrochloric acid is used as the acid in this reaction, the hydrolysis reaction can occur very easily.
If the hydrolysis reaction occurs, it will reduce the yield of the desired product, which is the diazonium salt of aniline. To prevent this, excess hydrochloric acid is added to the reaction mixture to ensure that the pH remains low and the hydrolysis reaction is suppressed.
Other options are not correct because:
- Option A: Hydrochloric acid does not suppress the concentration of free aniline, but rather helps to convert it to the diazonium salt.
- Option C: While excess hydrochloric acid does ensure a stoichiometric amount of nitrous acid, this is not its primary purpose in the reaction.
- Option D: Hydrochloric acid is already an acid, so it does not need to be added to neutralize any base that is liberated during the reaction.
Therefore, the correct answer is option B: excess hydrochloric acid is used primarily to suppress the hydrolysis of the diazonium salt to phenol.
When aniline is diazotized with sodium nitrite and hydrochloric acid, the hydrochloric acid is used primarily to suppress the hydrolysis of the diazonium salt to phenol.
The breakdown of the diazonium salt to phenol is a competing reaction during diazotization. This is more pronounced in acidic conditions, and since hydrochloric acid is used as the acid in this reaction, the hydrolysis reaction can occur very easily.
If the hydrolysis reaction occurs, it will reduce the yield of the desired product, which is the diazonium salt of aniline. To prevent this, excess hydrochloric acid is added to the reaction mixture to ensure that the pH remains low and the hydrolysis reaction is suppressed.
Other options are not correct because:
- Option A: Hydrochloric acid does not suppress the concentration of free aniline, but rather helps to convert it to the diazonium salt.
- Option C: While excess hydrochloric acid does ensure a stoichiometric amount of nitrous acid, this is not its primary purpose in the reaction.
- Option D: Hydrochloric acid is already an acid, so it does not need to be added to neutralize any base that is liberated during the reaction.
Therefore, the correct answer is option B: excess hydrochloric acid is used primarily to suppress the hydrolysis of the diazonium salt to phenol.
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In the diazotisation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily toa)Supress the concentration of free anilineb)Supress the hydrolysis to phenolc)Ensure a stochiometric amount of nitrous acidd)Neutralise the base liberatedCorrect answer is option 'B'. Can you explain this answer?
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In the diazotisation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily toa)Supress the concentration of free anilineb)Supress the hydrolysis to phenolc)Ensure a stochiometric amount of nitrous acidd)Neutralise the base liberatedCorrect answer is option 'B'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about In the diazotisation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily toa)Supress the concentration of free anilineb)Supress the hydrolysis to phenolc)Ensure a stochiometric amount of nitrous acidd)Neutralise the base liberatedCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In the diazotisation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily toa)Supress the concentration of free anilineb)Supress the hydrolysis to phenolc)Ensure a stochiometric amount of nitrous acidd)Neutralise the base liberatedCorrect answer is option 'B'. Can you explain this answer?.
In the diazotisation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily toa)Supress the concentration of free anilineb)Supress the hydrolysis to phenolc)Ensure a stochiometric amount of nitrous acidd)Neutralise the base liberatedCorrect answer is option 'B'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about In the diazotisation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily toa)Supress the concentration of free anilineb)Supress the hydrolysis to phenolc)Ensure a stochiometric amount of nitrous acidd)Neutralise the base liberatedCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In the diazotisation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily toa)Supress the concentration of free anilineb)Supress the hydrolysis to phenolc)Ensure a stochiometric amount of nitrous acidd)Neutralise the base liberatedCorrect answer is option 'B'. Can you explain this answer?.
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