Tuesday, September 8, 2009

IIT JEE Chemistry Final Revision Set No. 4

1. Assertion-Reason

Statement: When nitrobenzene is treated Br2 in presence of FeBr3 the major product formed is m-bromonitrobenzene.

Reason: Easier loss of H+ to region aromaticity from the meta position than from ortho and para position.

2. Most stable carbonium ion is:

a. p-NO2-C6H4-+CH2
b. C6H5+CH2
c. p_Cl-C6H42-+CH2
d. p-CH3O-C6H4-+CH2

3. State true or false

Toluene reacts with bromine in the presence of light to give benzyl bromine while in presence of FeBr3 it gives p-bromotoluene.

4. Give the steps to carry out the tranformation

Ethylbenzene to benzene.

5. Assertion - Reason type.
Statement: Normally benzene give electrophilic substitution reaction rather than electrophilic addition.

Reason: It has no double bonds

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