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Tutorial 1 - Solutions - CHEMISTRY 1AA3 January 2010...

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CHEMISTRY 1AA3 January 2010 TUTORIAL PROBLEM SET 1 – SOLUTIONS ______________________________________________________________________________ Page 1 of 5 Chem 1AA3 – Tutorial 1 Solutions 1. Which of the following formulas could represent an alkyne? an alkene? a cycloalkene? (i) C 10 H 20 (ii) C 6 H 12 (iii) C 4 H 6 (iv) C 8 H 18 SOLUTION: alkyne general formula: C n H 2n-2 alkene general formula: C n H 2n cycloalkene general formula – same as alkyne (2 degrees of unsaturation) Formulas (i), (ii) could be alkenes, (iii) could be an alkyne or a cycloalkene. Formula (iv) represents an alkane (fully saturated with hydrogen atoms), C n H 2n+2 . 2. Draw line structures for all of the structural isomers that satisfy the molecular formula C 6 H 14 . Name each structural isomer using the IUPAC rules. SOLUTION: Note that they are all alkanes. Naming allows you to check for inadvertently drawing the same structure in two different ways. 3. For each of the given structural formulas, draw the Lewis structure. Remember that carbon is always tetravalent (has four bonds), and it can form double and triple bonds to many different atoms (e.g. O, N). Use these ideas to determine each Lewis structure, drawing multiple bonds where necessary to satisfy the valency at each atom.
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