Question

thiophene on heating with acetic anhydride in presence of h3PO4 gives...
1. Tetrahydrothiophene
2. 2-acetyl thiophene
3. 2-phenyl azo-thiophene
4. thiophene2-sulphonic acid
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Answer 1

Molecular orbital theory is widely used to interpret the structure of aromatic and hetero-aromatic

compounds. According to Huckel approximation the electrons in the p-orbitals are treated

separately from those electrons which are involved in the formation of the bonds in the plane of

the ring. The six p-orbitals are combined to give six delocalized π molecular orbitals (3 π

bonding molecular orbitals and 3 antibonding π molecular orbitals). Each of the six π -molecular

orbitals can accommodate a maximum of two electrons. The 3 bonding π -molecular orbitals are

of lower energies than the 3 antibonding π -molecular orbitals. Thus the electrons will be filled in

lower 3 bonding π -molecular orbitals first. We will be discussing here the π -molecular orbitals

of pyrrole and pyridine as model compounds of five and six membered heterocyclic compounds.

Answer 2

Answer:

Thiophene on heating with acetic anhydride in presence of h3PO4 gives...

1. Tetrahydrothiophene.

Explanation:

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