please explain this ✔️
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Dehydration reactions are SN1 in nature.
Therefore a carbocation is bound to form.
The nitro, cyano, keto and aldehydic groups given in the questions are all electron withdrawing groups. Hence they increase the electrophilicity (+ve charge) on carbon atoms.
Hence Inorder to answer this question we have to know the order of electron withdrawing capabilities of various groups
The order is
NO2 > CN > CHO (aldehyde)> CO (ketone).
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option 4 is the correct sequence
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