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Reactivity of aldehydes

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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.

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Reaction Products from Aldehydes and Alcohols in Atmosphere

In air pollution chemistry and control, how is it that many common organic air pollutants such as methanol, formaldehyde, acetaldehyde, and phenol lose their oxygen ions and get converted ultimately to CO2 and H2O.
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CH3OH --> CH4
CH2O --> CO2 + H2O
CH3CHO --> C2H4
C6H5OH --> C6H6

In each of these cases, where does the oxygen go and what causes it?

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