Exam1 - CHEM 234 Exam #1 Fall 2006 Name: Directions: Answer...

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CHEM 234 – Exam #1 – Fall 2006 N a m e : Directions: Answer the questions in the spaces provided. Keep your discussions short – pictures and a BRIEF explanation are often more helpful than long, wordy answers. 1. (15 points) Consider the neutral compound below. A) In the boxes below, indicate the likely hybrid orbitals used on the atoms indicated by the arrows. B) CIRCLE regions of the molecule that will have π – electron delocalization over 3 or more atoms. C) What is the geometry (shape) of the bonds around the carbon center numbered 1? _____________________________________ D) What is the geometry (shape) of the hybrid orbitals on the nitrogen numbered 2? _____________________________________ E) What is the geometry (shape) of the bonds around the nitrogen numbered 2? _____________________________________ OH NH N 1 2
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2. (7 points) The molecule CF 4 has no dipole moment, even though C-F bonds are very polar. Explain – Be sure to include a structure with partial charges indicated. 3. (9 points) Place the following compounds in order of increasing BASICITY (weakest to strongest). Briefly explain your relative rankings in terms of inductive and resonance effects.
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Exam1 - CHEM 234 Exam #1 Fall 2006 Name: Directions: Answer...

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