What is the correct order of reactivity of alcohols toward reactions involving cleavage of C-O bond?

What is the correct order of reactivity of alcohols toward reactions involving cleavage of C-O bond? Correct Answer 3°>2°>1°

Alkyl groups are electron releasing groups and increase the electron density towards oxygen making the C-O more polar. This makes the cleavage of the bond between C and O a lot easier.
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