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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...
Suppression of hydrolysis to phenol:
Aniline can undergo hydrolysis in the presence of strong acids to form phenol. This reaction can occur under acidic conditions due to the presence of the benzene ring in aniline. The excess of hydrochloric acid in the diazotisation reaction helps to suppress this undesirable hydrolysis reaction.
Role of hydrochloric acid:
- The excess of hydrochloric acid ensures that the aniline remains protonated, reducing its reactivity towards hydrolysis.
- By maintaining a high concentration of HCl, the equilibrium of the hydrolysis reaction is shifted towards the formation of the diazonium salt, rather than phenol.
- The acidic conditions provided by the excess of hydrochloric acid also help in stabilizing the diazonium ion formed during the diazotisation reaction.
Prevention of unwanted byproducts:
- By suppressing the hydrolysis of aniline to phenol, the excess of hydrochloric acid helps in improving the yield and selectivity of the desired product, which is the diazonium salt.
- The excess of hydrochloric acid also helps in preventing the formation of other unwanted byproducts that may result from the hydrolysis of aniline.
Therefore, the primary role of the excess of hydrochloric acid in the diazotisation of aniline is to suppress the hydrolysis of aniline to phenol and ensure the efficient formation of the diazonium salt.
Aniline can undergo hydrolysis in the presence of strong acids to form phenol. This reaction can occur under acidic conditions due to the presence of the benzene ring in aniline. The excess of hydrochloric acid in the diazotisation reaction helps to suppress this undesirable hydrolysis reaction.
Role of hydrochloric acid:
- The excess of hydrochloric acid ensures that the aniline remains protonated, reducing its reactivity towards hydrolysis.
- By maintaining a high concentration of HCl, the equilibrium of the hydrolysis reaction is shifted towards the formation of the diazonium salt, rather than phenol.
- The acidic conditions provided by the excess of hydrochloric acid also help in stabilizing the diazonium ion formed during the diazotisation reaction.
Prevention of unwanted byproducts:
- By suppressing the hydrolysis of aniline to phenol, the excess of hydrochloric acid helps in improving the yield and selectivity of the desired product, which is the diazonium salt.
- The excess of hydrochloric acid also helps in preventing the formation of other unwanted byproducts that may result from the hydrolysis of aniline.
Therefore, the primary role of the excess of hydrochloric acid in the diazotisation of aniline is to suppress the hydrolysis of aniline to phenol and ensure the efficient formation of the diazonium salt.
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In the diazotisation of aniline with sodium nitrite and hydrochloric a...
Suppress the concentration of free aniline available for coupling
Excess of HCl is used to convert free aniline to aniline hydrochloride. Other wise free aniline would undergo coupling reaction with benzene diazonium chloride
Excess of HCl is used to convert free aniline to aniline hydrochloride. Other wise free aniline would undergo coupling reaction with benzene diazonium chloride
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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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