Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Priyanshu kumar
The aromaticity order in heterocycles(mainly pyrrole, thiophene, furan) depends on the electronegativity of the heteroatom : 0 > N > S and, therefore, the aromaticity follows the order as : Thiophene > Pyrrole > Furan. And the extra stabilization of thiophene is attributed to the expansion of valence shell of sulfur by using d-orbitals in hybridization.Well one of the factor also responsible is the resonance energy (relates to the stability of aromatic compounds), more is the resonance energy more is the aromaticity. Aromaticity directly proportional to stability So, furan is least stable. See the attached figure below......
.