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  4. Arrange reactivity of given compounds in decreasing order for electrophilic substitution reaction 1. Furan 2. Pyrrole 3. Thiophene

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Q. Arrange reactivity of given compounds in decreasing order for electrophilic substitution reaction
$1.$ Furan
$2.$ Pyrrole
$3.$ Thiophene

NTA AbhyasNTA Abhyas 2022

Solution:

Solution
The decreasing order for electrophilic substitution reaction is as Pyrrole > Furan > Thiophene.
Degree of reactivity depends on electron availability or electron donating power of the hetero atom of the ring. In thiophene lone of S is delocalised by the ring as well as by the vacant d-orbitals. Hence electron donating power of S is least.