AIIMS 2019 Chemistry Electrophilic Substitution MCQ Question
For the diazonium ions the order of reactivity towards the diazo-coupling with phenol in the presence of dilute is:
I<IV<II<III
I<III<IV<II
III<I<II<IV
III<I<IV<II
Correct Answer
Detailed Explanation
Electrophilicity increases with the presence of electron-withdrawing groups, which stabilize positive charges and enhance the reactivity of electrophiles. Option B (CH₃) is a weak electron-donating group, which makes the compound less electrophilic compared to the strong electron-withdrawing groups like NO₂ (option A), which significantly increases electrophilicity. Options C (OCH₃) and D (NMe₂) are also electron-donating groups, further reducing electrophilic character. Therefore, the presence of strong electron-withdrawing groups like NO₂ enhances electrophilicity more than the weak electron-donating effects of CH₃.
Found an issue with this question?
Related Questions
More from Organic Chemistry
How many total carbons are found in palmitic acid?
In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe³⁺ due to the formation of -
How many geometrical isomers are possible in the following two alkenes? (i) CH₃−CH=CH−CH=CH−CH₃ (ii) CH₃−CH=CH−CH=CH−Cl