Heterocyclic compounds-Part III

heteroatom present in Benzothiophene is

• O

• S

• N

• O and S

• O and N

Identify benzothiazole

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Suffix used for unsaturated 5 membered ring is

• irene

• ete

• ole

• ine

preferential order for numbering of more than one heterocycle if present in ring is

• N < S < O

• N < O < S

• S < N < O

• order alphabetcally

Suffix for 6 membered heterocycle is

• ine

• ole

• olidine

• ete

Electrophilic substitution in furan usually occurs at

• the O atom

• both the C2 & C3 atoms

• the C2 atom

• the C3 atom

Which is most reactive in electrophilic aromatic substitution?

• furan

• oxazole

• pyrrole

• thiazole

In thiazole heteroatom present is

• sulfur & nitrogen

• sulfur & oxygen

• oxygen & nitrogen

• only sulfur

Basicity order of following hereocyclic compound is

• thiophene > furan > pyrrole

• thiophene > pyrrole > furan

• pyrrole > furan > thiophene

• pyrrole > thiophene > furan

Furan when react with acetic anhydrides and lewis acid yield

• 2-acetyl furan

• 3-acetyl furan

• 4-acetyl furan

• all of these