Assignment 2
Answers to question 2 are generally OK. The structure for 2f is missing a hydrogen if this is 1-pentyne. Also for tidying up the names, remember that dashes go between numbers and letters, while commas go between numbers, with no spaces anywhere.
C3H4 (2h) could be several things, propyne, 1,2-propadiene, or cyclopropene.
Structure 3a is missing a hydrogen. For 3b (ethyne) you should probably show the structure like the others (showing the triple bond) since these are structural formulas, even though there aren't any other possibilities in this case.
Check them hydrogens in 3c and 3e! Structure 3h is an alkene; also check the number of carbons!
For question 4, remember that isomers have the same number of each kind of atom (check those hydrogens) so a butadiene would not be a structural isomer of butene. Hint: cis and trans isomers!
Questions 5 & 7 still to do...
In question 8, larger alkane molecules are broken down into smaller alkanes, alkenes, and H2 at high temperature (around 500°C) with or without a catalyst. This process is known as "cracking". With a suitable catalyst, the cracking process yields alkanes with highly branched structures used in fuels such as gasoline.
Steve
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