What will be the degree of unsaturation in the product when a compound having molecular formula 
is treated with metallic sodium in ether? (Given that halogens are present on opposite corner in a cyclic compound).
Text Solution
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Determination of molecular structure of 
Degree of unsaturation 
According to question, the compound is cyclic which means the compound is cyclobutane derivative having 
and 
at diagonal position. Hence, the structure of compound is
1-bromo 3-chlorocyclobutane
This compound on reaction with metallic sodium produces bicyclic product as follows
Saturated monocyclic compound (reactant) has 
Saturated bicyclic compound (product) has 
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