Question

Which of the following order is correct for the decreasing re activity to ring monobromination of the following compounds:-

• A. I>II>III>IV
• B. II>III>IV>I
• C. I>III>II>IV
• D. III>I>II>IV

Answer 1

The correct option is C I>III>II>IV

The ring bromination is electrophilic aromatic substitution reaction. When electron releasing groups such as methyl group are present, the electron density of the ring is higher and the reactivity is higher.

When electron withdrawing groups such as carboxylic group or nitro group are present, the electron density of the ring and the reactivity is lower.

Hence, the decreasing order of the reactivity towards ring monobromination is $I>III>II>IV$.