Which of the following is most reactive towar | vedclass

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(A) Sulphonation is an electrophilic aromatic substitution reaction. The rate of this reaction depends on the electron density of the aromatic ring. E

Vedclass · Accepted Answer

$m$-Xylene

Vedclass · Answer

(A) Sulphonation is an electrophilic aromatic substitution reaction. The rate of this reaction depends on the electron density of the aromatic ring. Electron-donating groups (like alkyl groups) increase the electron density of the ring,making it more reactive towards electrophiles. $m$-Xylene has two methyl groups at the $1$ and $3$ positions. These groups are meta-directing relative to each other and reinforce the activation of the ring at the $4$-position. In $m$-xylene,the two methyl groups provide a greater inductive effect and hyperconjugation compared to toluene (one methyl group) and $o$-/$p$-xylene (where steric hindrance and electronic effects are less favorable for the specific electrophilic attack). Therefore,$m$-xylene is the most reactive among the given options.

Which of the following is most reactive towards sulphonation?

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