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Chemistry Entrance Test - 3

A test by Muggu.

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	Both the nitro derivatives have no bromine atom at a position ortho to the nitro group
	The compound A has a dipole moment

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In which of the following diagrams of enthalpy vs reactions progress for two step reactions is the second step fast but essentially irreversible while the first step slow and reversible

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Hydration of the carbonyl group is least effective in the case of

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	chloral
	glyoxal
	acetaldehyde

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Which of the following is most stable carbanion

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A is :

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The pair of species / molecules having tetrahedral geometry is

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	and $[Ni(CN)_4]^{2-}$
	and $[Cu(NH_3)_4]^{2+}$
	and 
	and

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In zinc blende structure , zinc , ions occupy alternate tetrahderal voids and $S^{2-}$ ions exists as fcc. The radii of $Zn^{2+}$ and $S^{-2}$ ions are 0.83 and 1.74 A^0 respectively. The edge length of the ZnS unit cell is

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