The general molecular formula of the alkanes is
AC$_n$H$_{2n+2}$CORRECT
BC$_n$H$_{2n-2}$
CC$_n$H$_{2n}$
DC$_n$H$_n$
JUPEBChemistryOrganic Chemistry: Hydrocarbons
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Why the answer is A, and why the others tempt you.
Alkanes are saturated hydrocarbons with only single bonds, so every carbon carries the maximum hydrogens, giving C$_n$H$_{2n+2}$. C$_n$H$_{2n}$ is the formula of alkenes and cycloalkanes, and C$_n$H$_{2n-2}$ of alkynes.
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