Both pyrrole and pyridine are aromatic compounds, and undergo electrophilic aromatic substitution (EAS). Using a resonance argum
ent, predict the regiochemistry of EAS on both pyrrole and pyridine. As part of your argument, you must draw resonance structures for the arenium ion leading to each possible regiochemistry, and compare the stabilities of the resonance hybrids. In addition, make a reasoned statement about whether you think each one would react faster or slower than benzene and why.
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Answer : The concentration of at equilibrium is, 0.244 M, 0.122 M and 1.267 M respectively.
Explanation :
The given chemical reaction is:
Initial conc. 0.439 0.317 0.877
At eqm. (0.439-x) (0.317-x) (0.877+2x)
As we are given:
The expression for equilibrium constant is:
Now put all the given values in this expression, we get:
x = 0.195 and x = 0.690
We are neglecting the value of x = 0.690 because equilibrium concentration can not be more than initial concentration.
Thus, the value of x = 0.195 M
The concentration of at equilibrium = (0.439-x) = (0.439-0.195) = 0.244 M
The concentration of at equilibrium = (0.317-x) = (0.317-0.195) = 0.122 M
The concentration of at equilibrium = (0.877+2x) = (0.877+2\times 0.195) = 1.267 M