Q. How many stereoisomers are possible for dichlorocyclobutane?

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Answer: 5

Solution:

1, 3-Dichlorocyclobutane can exist in cis and trans forms, trans-1, 2-Dichlorocyclobutane can exist in (+) - and (-) - forms. However, cis-1, 2 Dichlorocyclobutane has a plane of symmetry and hence it can exist as meso isomer.