How many structural isomers and stereoisomers of bromopiperidine are possible?
b. How many stereoisomers of 4-chlorocyclo-hexane are possible?
c. How many optically active and inactive isomers of $2, 3, 4, 5$ - tetrachloroadipic acid are possible?
d. How many meso diastereomers of $C_{6} H_{12} B r_{2}$ are possible
e. How many optically active inactive isomers of $1, 2, 3 -$ trimethylcyclohexane are possible?

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Five isomers, one achiral (meso) and two pairs of enantiomers.
a.
b. Tow, a pair of enantimoers.

Number of chiral centres $= 4$ (same terminal group)
$O . A . I = 2^{n} = 2^{4 - 1} = 2^{3} = 8$
$O . I . A = (meso form) = 2^{(n - 2) / 2} = 2^{(4 - 2) / 2} = 2^{1} = 2$
Total isomers $= 10$
d. Three meso diastereomers:

e. Four, two meso and one pair of enantiomers

Updated on:21/07/2023