Nalanda Open University
Annual Examination 2016
B.Sc. Chemistry (Honours), Part-II
Paper-IV
Time: 3.00 Hrs. Full Marks: 80
Answer any Five questions. All questions carry equal marks.
1. What is Grignard Reagent? How Grignard reagents can be prepared. How
can you obtain the following with the help of Grignard reagents:-
Primary alcohol Secondary alcohol
Terhary alcohol Carboxylic acid
2. Why amino acids are weaker acids that the corresponding unsubstituated
acids? Explain the following with reference.
Peptide Linkage Zwitter ion
3. State and explain conformation. Explain conformations of Ethane and
Cyclohexane.
4. Is ethyl zinc zodide is Grignard reagent? Why is zinc dialkyl less
reactive than lithium alkyl.
How would you synthesize the following:-
C6 H5 — COOH from C6 H5 Br
OH

CH3CH2 — CH — CH3 from CH3 Mg Br

CH3
C6H5 — C — CH3 from (CH3)zn

O
5. How is the structure of D-glucose established?
6. Explain what is observed when,
A beam of light is passed through the Collidal solution.
An electric current is passed through the Collidal solution.
Write at least four application through the Collaidal solution.
7. What do you understand by Kohlrausch Law? What are their application of
Kohlrausch Law.
8. How would you introduce the following in an aromatic ring?
— COOH — COCH3 — Cl
9. How nitrobenzene is prepared in the laboratory? And also prepare it from
benzene diazonium chloride. Give its reduction products in acid/alkaline/
neutral medium. Also give equations in support of your answer.
10. Write notes on following:-
Sand Meyer reaction Friedal-craft reaction
Benzoin Condensation Cannizzaro reaction