All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2010 Chemistry

Q. 24. The Gibbs energy for the decomposition of Al₂O₃ at 500°C is as follows:


The potential difference needed for electrolytic reduction of Al2O3 at 500°C is at least.

1. 4.5 V
2. 3.0 V
3. 2.5 V
4. 5.0 V

Sol :

Answer: (3)

Q. 25. Consider the following bromides:

The correct order of SN1 reactivity is.

1. B > C > A
2. B > A > C
3. C > B > A
4. A > B > C

Sol :

More stable the carbocation, more is the rate of S_N1 reaction. Thus, the order of S_N1 reactivity is (B) > (C) > (A)

Answer: (1)