Question

1.Cycloheptatrienylium cation is more stable than Cycloheptatriene — Why?

2.Cyclopropenyl cation is a planar molecule. Is it “Aromatic”, “Non-aromatic” or “Antiaromatic”?

3.Imidazole with 8 π electrons is aromatic — Why?

4.Furan with 8 π electrons is aromatic — Why?

5.Thiophene with 8 π electrons is aromatic — Why?

6.Pyrene with 16 π electrons is aromatic — Justify.

7.The compound [10] Annulene is not aromatic — Justify.

8.What do you mean by “Pericondensed” and “Catacondensed” polycyclic aromatic hydrocarbons (PAHs) ? Give two examples in each case (structures are required).

9.EAS can be considered as Lewis acid-Lewis base reaction — Justify.

10.How the electrophilicity of bromine (a weak electrophile) can be increased by using FeBr3?

11.Write the name of the electrophiles in nitration and sulfonation reactions?

12.Write the difference between ‘reagent’ and ‘catalyst’ of a reaction.

13.Write the name and resonance structures of the electrophile in Friedel-Crafts acylation reaction

Answer 1