A This compound contains a stereocentre adjacent to the carbon-oxygen double bond of an ester, and one of the substituents on the stereocentre is a hydrogen atom. Thus the compound will racemize under basic conditions.
B This compound contains a stereocentre adjacent to the carbon-oxygen double bond of an ester, but there is no hydrogen atom attached to the stereocentre. Thus the compound will not racemize under acidic or basic conditions.
C This compound contains a stereocentre adjacent to the carbon-oxygen double bond of a ketone, and one of the substituents on the stereocentre is a hydrogen atom. Thus the compound will racemize under acidic and basic conditions.
D This compound contains a stereocentre adjacent to the carbon-oxygen double bond of an aldehyde, and one of the substituents on the stereocentre is a hydrogen atom. Thus the compound will racemize under acidic and basic conditions.
E This compound contains a stereocentre adjacent to the carbon-oxygen double bond of an aldehyde, but there is no hydrogen atom attached to the stereocentre. Thus the compound will not racemize under acidic or basic conditions.
F This compound contains a stereocentre adjacent to the carbon-oxygen double bond of both a ketone and an ester, and one of the substituents on the stereocentre is a hydrogen atom. Thus the compound will racemize under acidic and basic conditions.
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