Give mechanism of Friedel Crafts acylation of anthracene.

Compare the basicities of pyrrole and pyridine.

What are different classes of polynuclear hydrocarbons? Explain each of them with suitable examples.

Why the 1^st position of naphthalene is more reactive than 2^nd position? Explain giving mechanism.

Give various resonance structures of carbocation formed during electrophilic substitution of furan.

a) Give the reaction for following conversions :

i) Furfural to furan

ii) Pyridine to 2-hydroxypyridine

 iii) Thiophene to 2,5-dihydrothiophene

What are active methylene compounds? Give their two examples. Why are they named so?

Describe the structure of hemoglobin along with a suitable diagram.

What is the role of magnesium ions in chlorophyll? Discuss.

Give a short account of the essential elements occurring in biological systems.

Arrange the following in decreasing order of C-O bond lengths giving justifications: Ni(CO)₄, [Co(CO)₄] - , [Fe(CO)₄] ^2- .

With suitable diagrams explain the polarity of the free CO molecule as well as when it binds with a transition metal cation.

Calculate the total number of electrons for the compound Co₂(CO)₈.

Explain the structure of Mn₂(CO)₁₀ based on valence bond approach.

What is meant by hapticity regarding organometallic compounds?

Give the structure of dimeric trialkylaluminium.

Explain the structure of Mn2(CO)10 based on valence bond approach.

What is meant by hapticity regarding organometallic compounds?

Give the structure of dimeric trialkylaluminium.

Give the difference between organometallic and coordination compounds.