2008Chem212Midterm

2008Chem212Midterm - Question 1. ( 8 Marks) a) Complete the...

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2 Question 1. ( 8 Marks) a) Complete the sentence. BH 4 is _________________ hybridized and CH 3 + is _________________ hybridized. b) Calculate the formal charge on BH 4 . ______________________ c) During the HBr addition to the compound below the positive ion intermediate has two resonance forms. Circle the more stable resonance form and briefly explain your choice. CH 3 CH 3 Br CH 3 CH 3 Br H H H CH 3 CH 3 Br H H HBr d) Draw all the resonance forms of the anion below that significantly contribute to the resonance hybride. O e) For the dehydration reaction below, circle the major product. H 2 SO 4 OH
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3 Question 2. ( 5 Marks) YOUR EXPLANATIONS BELOW SHOULD BE NO MORE THAN ONE OR TWO SENTENCES. FOR THE ACID BASE REACTIONS, ±THE EQUILIBIUM LIES TO THE SIDE OF THE ACID WITH THE HIGHER PKA² IS NOT AN ACCEPTED ANSWER. a) BRIEFLY explain why the equilibrium of this acid base reaction lies to the right. . CH 3 O+ N H 3 CH 3 OH + NH 2 LEFT RIGHT b) BRIEFLY explain why the cyanide does an S N 2 substitution with the iodide rather than the chloride of 1-chloro-3-iodopropane.
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This note was uploaded on 11/15/2010 for the course CHEM 212 taught by Professor Harpp during the Spring '08 term at McGill.

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2008Chem212Midterm - Question 1. ( 8 Marks) a) Complete the...

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