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The general formula for the homologous series of alkanes is CₙH₂ₙ₊₂ The first four members of the alkanes are methane, ethane, propane and butane. Alkane molecules can be represented in the following forms: (C₂H₆ or drawn out version).
4.7.2.1 Structure and formulae of alkenes. Alkenes are hydrocarbons with a double carbon-carbon bond. The general formula for the homologous series of alkenes is CₙH₂ₙ. Alkene molecules are unsaturated because they contain two fewer hydrogen atoms than the alkane with the same number of carbon atoms.
Alkanes, Alkenes, Alkynes and Cyclic Hydrocarbons - Worksheet. (Please note: highlighted questions should be completed; other questions are for additional practice if required)
1. Alkenes have double bonds; alkynes have triple bonds. Both undergo addition reactions. 2. 4-methyl-1-pentyne 3. No; a triply bonded carbon atom can form only one other bond. It would have to have two groups attached to show cis-trans isomerism. Key Takeaway • Alkynes are hydrocarbons with carbon-to-carbon triple bonds and properties
Naming and Drawing Alkenes Worksheet and Key . 1) Draw and name the cis and trans condensed structure of: . 2. Name the following alkenes (include cis-‐ or trans-‐ for the alkenes that when appropriate) . d) trans-‐2-‐pentene . line-‐bond structure . condensed structure . skeletal structure .
Alkenes and Alkynes Worksheet and Key 1. Draw the line bond structures for the following alkenes, cyclic alkenes, and alkynes: a) alkenes that contain 4 carbon atoms (three possible) b) cyclic alkenes that contain 4 carbon atoms (three possible) c) alkynes that contain 4 carbon atoms (two possible, neither of them are cyclic alkynes) 2.
The general formula for the straight-chained alkynes is C n H 2n-2. Alkynes are named in much the same way as the alkenes, except that their names end with the suffix ‘-yne,’ signifying the triple bond. Once again, the triple bond must be located within the parent chain, and it should be assigned the lowest possible number. Additional Rules ...
