WBJEE 2012 Physics,Chemistry, Maths solved question paper


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41. Which one of the following characteristics belongs to an electrophile?
A. It is any species having electron deficiency which reacts at an electron rich C-centre
B. It is any species having electron enrichment, that reacts at an electron deficient C-centre
C. It is cationic in nature
D. It is anionic in nature


42. Which one of the following methods is used to prepare Me
3COEt with a good yield?
A. Mixing EtONa with Me3CCl
B. Mixing Me3CONa with EtCl
C. Heating a mixture of (1:1) EtOH and Me3COH in presence of conc. H2SO4
D. Treatment of Me3COH with EtMgI


43. 58.5 gm of NaCl and 180gm of glucose were separately dissolved in 1000ml of water. Identify the correct
statement regarding the elevation of boiling point (b.p.) of the resulting solutions.
A. NaCl solution will show higher elevation of b.p.
B. Glucose solution will show higher elevation of b.p.
C. Both the solution will show equal elevation of b.p.
D. The b.p. elevation will be shown by neither of the solutions




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WBJEE 2012 Physics Solved Paper and Answer keys


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