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  4. Rank the following compounds in decreasing order of reactivity in electrophilic aromatic substitution reaction <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/c-swsupzwle8zx.png />

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Q. Rank the following compounds in decreasing order of reactivity in electrophilic aromatic substitution reaction

Question

NTA AbhyasNTA Abhyas 2020

Solution:

Rate of electrophilic aromatic substitution is effected by group/s already present. If they $\left(- O - , - N H - , - C H_{2} -\right)$ are ring activating and ortho, para directing due to +R and +H effects reactivity is more but if they $\left(- C O - , - N O_{2} , - C N\right)$ are ring deactivating and meta directing groups due to -R and -H effects reactivity decreases.

Here reactivity order is 3 > 1 > 4 > 2.