Engineering
Chemistry
Structural Isomerism
Conformational Isomerism
Optical Isomerism
Question

P(C6H12) Cl2/ 2 Monochloro structure
(Cycloalkane)
How many stereoisomers are possible by P

4

No stereoisomerism by P

2

3

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Solution
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P is cyclohexane (C6H12), a symmetrical molecule. Chlorination under Cl2/hν gives monochlorocyclohexane. The chlorination can occur at two distinct positions: a secondary carbon (CHCl) or a tertiary carbon (CCl) if present, but cyclohexane has only equivalent secondary carbons.

All carbon atoms are equivalent, so only one monochloro compound is formed: chlorocyclohexane. This compound has a chiral center (the carbon with Cl).

A chiral center gives rise to a pair of enantiomers (R and S configurations). Therefore, 2 stereoisomers are possible.

Final Answer: 2