What is the general molecular formula for non-cyclic alkanes?
Answer and explanation
Correct answer: D. CnH2n+2
- Step 1: Alkanes are saturated hydrocarbons containing only carbon-carbon single bonds.
- Step 2: Every internal carbon bears 2 hydrogens, while terminal carbons bear an extra hydrogen, yielding CnH2n+2.
Answer
CnH2n+2.
Why not the others: 'CnH2n' represents alkenes or cycloalkanes; 'CnH2n-2' represents alkynes or alkadienes; 'CnHn' represents annulenes such as benzene (C6H6).
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