Show wheter the following compounds exhibit aromaticity.
(a) Pyridine, (b) Cyclo-octateraene, ( c) Pyrrole, (d) Cyclobutaiene, ( e) Furan, (f) Thiophene.

Which of the following does not satisfy Huckel's rule? (a) Benzene (b) 1, 3-cyclobutadiene (c) Naphthalene (d) Furan

Identify the compounds A, B, C, D, E and F.

The three compounds (A),(B), and (C) on hydrogenation with H_(2)+Pd give (D),(E) and (F) , respectively. Compounds (D),(E) and (F) are :

The three compounds (A),(B), and (C) on hydrogenation with H_(2)+Pd give (D),(E) and (F) , respectively. Compounds (D),(E) and (F) are :

Pyridine like benzene, has six pi -electrons in delocalized pi -orbitals, but unlike benzene the orbitals will be deformed as electrons are more attracted towards the nitrogen atom because of its high electro negativity. This is reflected in the dipole of pyridine which has the negative end on N and the positive end on the nucleus. We can compare the respective properties of benzene, pyridine, pyrrole, furan and thiophene, which very frequently give aromatic electrophilic and nucleophilic substitution reactions in different positions. Which of the following compounds are aromatic.

Pyridine like benzene, has six pi -electrons in delocalized pi -orbitals, but unlike benzene the orbitals will be deformed as electrons are more attracted towards the nitrogen atom because of its high electro negativity. This is reflected in the dipole of pyridine which has the negative end on N and the positive end on the nucleus. We can compare the respective properties of benzene, pyridine, pyrrole, furan and thiophene, which very frequently give aromatic electrophilic and nucleophilic substitution reactions in different positions. Arrange the following in increasing order of aromatic character.