What is beta carbon, beta hydrogen, alpha carbon and alpha hydrogen?

what is beta carbon, beta hydrogen, alpha carbon and alpha hydrogen?

The alpha carbon is the first carbon that attaches to a functional group (the carbon is attached at the first, or alpha, position).
The second carbon is the beta carbon.
Hydrogen attached to an alpha carbon is called an “alpha-hydrogen” (α-hydrogen), a hydrogen on the beta-carbon is a beta-hydrogen, and so on.
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