In the diazotisation of aniline with sodium n | vedclass

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(A) The diazotisation reaction involves the conversion of aniline to a diazonium salt using $NaNO_2$ and $HCl$ at $0-5 \ ^{\circ}C$. An excess of $HCl

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Suppress the concentration of free aniline available for coupling

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(A) The diazotisation reaction involves the conversion of aniline to a diazonium salt using $NaNO_2$ and $HCl$ at $0-5 \ ^{\circ}C$. An excess of $HCl$ is used to prevent the coupling reaction between the formed diazonium salt and the unreacted aniline. If free aniline is present,it can react with the diazonium salt to form an aminoazo compound (coupling product). Therefore,$HCl$ protonates the free aniline to form anilinium ions $(C_6H_5NH_3^+)$,which are not reactive towards the diazonium salt,thus suppressing the coupling reaction.

In the diazotisation of aniline with sodium nitrite and hydrochloric acid,an excess of hydrochloric acid is used primarily to

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