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• AIPMT 2010 Chemistry

AIPMT 2010 Chemistry

  

Q. 10. The reaction of toluene with Cl₂ in presence of FeCl₃ gives ‘X’ and reaction in presence of light gives ‘Y’. Thus, ‘X’ and ‘Y’ are:

1. X = Benzal chloride, Y = o-chlorotoluene
2. X = m-chlorotoluene, Y = p-chlorotoluene
3. X = o-and p-chlorotoluene, Y = Trichloromethyl benzene
4. X = Benzyl chloride, Y = m-chlorotoluene

Sol.   

 

Answer : (3)

Q. 11. For an endothermic reaction, energy of activation is E_a and enthalpy of reaction is ΔH (both of these in kJ/mol). Minimum value of E_a will be:

1. less than ΔH
2. equal to ΔH
3. more than ΔH
4. equal to zero

Sol.

Answer : (3)

Q. 12. The correct order of increasing reactivity of C − X bond towards nucleophile in the following compounds is:

1. I < II < IV < III
2. II < III < I < IV
3. IV < III < I < II
4. III < II < I < IV

Sol:

Tertiary alkyl halide has the highest rate in nucleophilic substitution. Aryl halide has the least rate due to partial double character. Presence of − NO₂ groups in ortho and para positions will increase the reactivity.

or I < II < IV < III

Answer : (1)