All India Engineering / Architecture Entrance Examination (AIEEE)
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AIEEE 2007 Chemistry
Q. 8. The secondary structure of protein refers to:
helical backbone. - hydrophobic interactions.
- sequence of amino acids.
- fixed configuration of the polypeptide backbone.
Sol: Secondary structure of a protein refers to the fixed configuration of the polypeptide skeleton. helix structure results only when intramolecular H−bonds are formed between 
of one amino acid residue and N−H of fourth amino acid residue in polypeptide chain. 
pleated structure is formed when intermolecular H−bond is formed between of one polypeptide chain with N−H of the other chain. Correct choice: (4)
Q. 9. Which of the following reactions will yield 2,2−dibromopropane?
Sol: 
Correct choice: (1)
Q. 10. In the chemical reaction, 
the compounds (A) and (B) are respectively:
Sol: 
This is carbylamine reaction. Correct choice: (4)
Q. 11. The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly:
- benzoyl chloride
- benzyl chloride
- o− and p−chlorotoluene
- m−chlorotoluene
Sol:
The reaction proceeds by electrophilic substitution mechanism.
Correct choice: (3 )