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Total number of P.I. (x) of tetrachloro cyclobutane can show geometrical isomers (y) than find out x+y:

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Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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Total number of optically active stereoisomers of CH3-CH-CH-CH-CH3.                                        Cl      Cl      Cl
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How many spatial orientations are possible in the following compound?

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The total number of optically active stereoisomers of tartaric acid is
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The total number of ketones with the molecular formula C6H12O is: 
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Total number of optically stereoisomers of CH3-CH-CH=CH-CH-CH3                                                    Cl                          Cl are
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Total number of optical active stereoisomers of the following compound are:

CH3-CH=CH-CHCl-CH=C=CH-CH=CH-CH3

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Calicene, C8H6, is expected to be fairly polar aromatic molecule. Which of the following resonance forms contributes to the greatest extent towards the real structure (resonance hybrid) of the molecule?
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In which of the following reactions hydrogen gas is not liberated.

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