# Why is the rate of nitration greater for thiophene than toluene?

Toluene has a $\ce{CH3}$ group attached to the benzene ring and as a result due to the +I effect of $\ce{CH3}$, the electron density in the ring increases and it undergoes nitration faster than a normal benzene ring.
But what causes thiophene to have an even greater rate of nitration ?

• (2) same size $\ce{2p\pi-2p\pi}$ overlap is better than different size $\ce{3p\pi-2p\pi}$. "And should i remove the answer?" I am not sure what to do in this case. Lemme think. – Gaurang Tandon Mar 2 '18 at 17:07