Which among the following statements is true about reactivity of haloarenes towards nucleophilic…
Which among the following statements is true about reactivity of haloarenes towards nucleophilic substitution reactions?
1. Haloarenes are very reactive towards nucleophilic substitution reaction.
2. In haloarenes, the \(\mathrm{C}-X\) bond acquires partial doubled bond character.
3. The \(\mathrm{C}-X\) bond in haloarenes is longer than the \(\mathrm{C}-X\) bond in haloalkanes.
4. In haloarenes, the phenyl cation formed as a result of self-ionisation is stable.
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Solution
Because of \(+R\) effect of halogen atom \(X\), the \(\mathrm{C}-X\) bond of haloarene acquires partial double bond character \((\mathrm{C}-X\) bond becomes shorter than that in haloalkanes) and nucleophilic substitution becomes difficult.
