•Primary (1°) carbon: a C
bonded to one other carbon
•Secondary (2°) carbon : a
C bonded to two other carbons
•Tertiary (3°) carbon : a
C bonded to three other carbons
•Quaternary (4°) carbon : a C bonded to four other carbons
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•Primary (1°) hydrogen: a H
bonded to primary (1°) carbon
•Secondary (2°) hydrogen : a
H bonded to secondary (2°) carbon
•Tertiary (3°) hydrogen : a
H bonded to tertiary (3°) carbon