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Q. Which of the following aldehyde contains $\alpha -C$ atom but does not have any $\alpha -H$ atom?

AIIMSAIIMS 2010

Solution:

The $C$-atom attached directly to the functional group is called a $C$-atom and the hydrogen attached to it, is called $\alpha- H$ atom. The structures of the given compounds are as
image
image
Thus, benzaldehyde is the compound that contains $\alpha- C$ atom but no $\alpha- H$ atom.