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Stereoisomerism

i 1, 2-ditchl...

Question

(i) 1, 2-ditchlorocyclopropane $= w$
(ii) 1,3-dimetyl-cyclobutane $= x$
(iii) 2-bromo-3-chlorobutane $= y$
(iv) 1, 3 dimethyl cyclohexane $= z$
Calculate total number of stereoisomer of the above compounds.
Sum of $w, x, y, z$ is:

14

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12

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16

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none

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Solution

The correct option is B $12$
1. Steroisomers of 1-2-ditchlorocyclopropane $= 3 = w$
2. Steroisomers of 1-3-dimethylcyclobutane $= 2 = x$
3. Steroisomers of 2- bromo-3-chlorobutane $= 4 = y$
4. Steroisomers of 1-3-dimethylcyclohexane $= 3 = z$
Sum $= w + x + y + z = 3 + 2 + 4 + 3 = 12$

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