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Reactivity of aldehydes

How would I list the following aldehydes in terms of increasing reactivity ClCH2CHO, CH3CHO, Cl3CCHO, and Cl2CHCHO? How would I explain the reasoning behind the answer in simple terms?

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You've got four aldehydes based on the 2 carbon structure. One has no chlorines (ethanal), the next has one chlorine (2-chloroethanal), another has two chlorines (2-dichloroethanal), and the last one has three chlorines ...

Solution Summary

This solution is provided in 130 words. It discusses chlorine and carbonyl groups in order to determine the order of reactivity of the aldehydes given.