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(C) The reaction of cyclohexane$-1,2-$diol with periodic acid $(HIO_4)$ causes oxidative cleavage of the $C-C$ bond between the two hydroxyl groups,re

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Cyclopent$-1-$enecarbaldehyde

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(C) The reaction of cyclohexane$-1,2-$diol with periodic acid $(HIO_4)$ causes oxidative cleavage of the $C-C$ bond between the two hydroxyl groups,resulting in the formation of hexane$-1,6-$dial (compound $A$).Hexane$-1,6-$dial contains two aldehyde groups and alpha-hydrogens,which undergo an intramolecular aldol condensation in the presence of $NaOH$ and heat $(\Delta)$.This cyclization leads to the formation of a five-membered ring with an unsaturated aldehyde group,which is cyclopent$-1-$enecarbaldehyde (compound $B$).

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