What is the correct formula of propanal?
A. CH_3CH_2CH_2OH
B. CH_3CH_2OCH_3
C. CH_3COCH_3
D. CH_3CH_2CO_2H
E. CH_3CH_2CHO
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Propanal is an aldehyde, which are organic compounds containing the group —CHO, formed by the oxidation of alcohols.
An aldehyde’s general formula is C_nH_{2n}+O, so propanal is C_3H_6O.
Which we can rewrite into CH_3CH_2CHO.
Therefore our answer is E.