Explanation

Saturated hydrocarbons are the alkanes, in which every carbon forms four single bonds and the chain carries the maximum possible number of hydrogens. Their general formula is CnH2n+2 (for example, methane CH4, ethane C2H6). CnH2n-2 corresponds to alkynes and CnH2n to alkenes/cycloalkanes. The option with n+1 or 2n-1 subscripts does not describe any standard hydrocarbon family.