2009%20203%20mt2%21-key0

2009%20203%20mt2%21-key0 - KEY Chemistry 203 Midterm 2,...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
KEY Page 1 of 11 Chemistry 203 Midterm 2, 2009 surname given names last initial student number signature MOLECULAR MODELS MAY BE USED 1 2 3 4 5 raw total total 30 13 20 20 7 90 10 1. (30 marks) Answer each of the following parts. a) Using curved arrows to represent electron movement, provide a mechanism for the reaction that takes place upon the mixing of sulfuric acid and ethanol: O H S O O O H OH O H S O O O OH H b) Provide structures below: • any aldehyde or ketone OH a carbonyl compound that reacts with sodium borohydride an alcohol containing four (4) carbons that will not react to produce a bromide when treated with PBr 3
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Student name/id number: __________ KEY ____________________ Page 2 of 11 c) Draw the major contributing resonance Lewis structures for anion X: O X 2 1 5 O Sketch a description of the orbital framework for the anion within X: O the other atoms are sp 3 -hybridized The hybridization of the carbon labeled “2” in X is: sp sp 3 sp 2 sp 5 sp 3 d cannot tell The hybridization of the carbon labeled “5” in X is: sp sp 3 sp 2 sp 5 sp 3 d cannot tell d) The compound KSCN is a source of the thiocyanate ion. Draw the two most stable Lewis structures for the thiocyanate ion: S C N S C N Provide the products of the reaction between KSCN and 1-bromobutane in a polar solvent: SCN NCS
Background image of page 2
Student name/id number: __________ KEY ____________________ Page 3 of 11 e) Consider the following two reactions: O N (1) (2) K H K Br Br solvent product The reaction that proceeds at the slower rate is: 1 2 (circle your answer) Justify your selection with brief comments: Both reactions are substitutions via a bimolecular mechanism. The attacking atoms in this case are in the same row of the periodic table, so as a generalization, the better base acts as a stronger nucleophile.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

2009%20203%20mt2%21-key0 - KEY Chemistry 203 Midterm 2,...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online