) Explain the stability of half-filled and completely filled orbitals giving suitable examples.

What are four quantum numbers? Give their significance.

 Explain the significance of and .

 List the applications of Schrodinger equation.

.Briefly discuss photoelectric effect. Also give the explanation of this effect given by Einstein.

Write the de-Broglie relationship for dual nature of matter. Also define matter waves.

Name different lines exhibited in the atomic spectrum of hydrogen.

Explain Geiger and Marsden’s $\alpha$-particle experiment using a suitable diagram.

Differentiate between amylose and amylopectin.

) Write the structures of ẞ-lactose and sucrose with appropriate labelling.

Explain mutarotation using glucose as the example.

Write the Fischer projection of D-glucose. Also write the Haworth projections of a-D-glucose and ẞ-D-glucofuranose.

 Briefly describe the primary, secondary, tertiary and quaternary structures of the peptides and proteins.

 Discuss Edman degradation of N-terminal identification of peptides giving suitable reactions.

How will you detect a 2-amino acid using ninhydrin?

How will you obtain valine using Gabriel phthalimide synthesis? Explain.

What is reductive amination? Give the product of the reductive amination of diazonium salt formed by 2,4,6-tribromoaniline.
15. Explain the products formed by the nitrosation reactions of primary, secondary and tertiary amines.

 benzenamine

) ethanamine

Write the products of reduction of nitrobenzene in basic medium under different conditions.