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| 1. |
Arrange the following in increasing order of reactivity towards sulphonation with fuming sulphuric acid: benzene, toluene, methoxybenzene, chlorobenzene. |
| Answer» Solution :Reactivity in electrophilic substitution REACTIONS increases as the electron DENSITY in the benzene ring increases. Now since METHOXY `(-OCH_(3))` group is a stronger electron-donating group than methyl `(-CH_(3))` group, therefore, METHOXYBENZENE is more reactive than toluene and both are more reactive than benzene. further, since chlorine has -I-effect, therefore, chlorobenzene is less reactive than even benzene. thus, the overall reactivity towards sulphonation increases in the ORDER: chlorobenzeneltbenzenelttolueneltmethoxybenzene. | |