Dichloropentane isomers

Indicate which of the following molecules are optical isomers and identify the chiral carbon atoms in those that are (a) CH,CHBrCH2CH3 (b) CH3CH2CHCl2 (c) l-bromo-2-chloropropane (d) 1,2-dichloropentane. 

Inductive effects on dipole moments and the effects of intervening atoms on electrostatic interaction energies are represented by polarizability centers In conjunction with bond centered dipoles. Solvation energies are estimated by means of a continuum dlpole-quadrupole electrostatic model. Calculated energies of a number of conformations of meso and racemic 2,4-dichloropentane and the iso, syndio, and hetero forms of 2,4,6-triehloroheptane give satisfactory representations of isomer and conformer populations. Electrostatic effects are found to be quite important. 

The specific rotation of (2/ ,3/ )-dichloropentane is equal in magnitude and opposite in sign to the specific rotation of (25,35)-dichioropentane because the compounds are enantiomers. There is no predictable relationship between the specific rotations of the (2R,35) and (2R,3R) isomers because they are diastereomers. 

Assume tliat you havecarried out a radical chlorination reaction on (P)-2-chloio-pentane and have isolated (in low yield) 2,4-dichloropentane. How many stereoisomers ot the product are toimed and in what latio Are any of the isomers optically active (See Problem 10.24.)... 

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