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Organic Chemistry

Lecture 2 objectives and skills

Objectives

Draw Lewis structures (structural formula) given formula, condensed formula, or skeletal structures.
Assign formal charge to a given atom in a molecule.
Identify and draw structural (constitutional) isomers.
Use VSEPR theory to predict the geometry about an atom center.
Identify hybridization (sp, sp2, sp3) of a given atom in an organic molecule.
Use molecular orbital theory to explain the formation of σ and π-bonds (bonding and anti-bonding MOs) in larger organic structures.
Draw a MO diagram for any given bond.

Skills

Visualization of 3D geometries from 2D images
Critical assessment using abstract concepts

This page is referenced by:

Lecture 2: Molecular Orbitals in Organic Structures 16 image_header 2020-03-21T15:03:58-07:00
Objective and Skills

KEY INFORMATION SUMMARY

HERE you can find extra resources to help you with this lecture!

PROBLEMS

Problem 2.1: Lewis Structures
1. Draw the Lewis Structures of CH₃CH₂CO₂Li and (CH₃)₃CCl. SOLUTION
2. Identify each bond as covalent or ionic. SOLUTION
3. Assign any non-zero formal charges. SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the problem below ;)

Problem 2.2: Bond-line drawings
1. Draw in all the missing hydrogens on each of the structures below. SOLUTION
2. Determine the molecular formula. SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the problem below ;)

Problem 2.3: Hybridization
1. Draw the Lewis structures and bond-line drawings of CH₃C≡CH, CH₃BH₂and CH₃NCO. SOLUTION
2. Determine the geometry and hybridization at each non-hydrogen atoms. SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the problem below ;)

Problem 2.4: Molecular Orbital (MO) Theory
1. Draw the Lewis Structures and bond-line drawings of CH₃CH₂CH₂^-, CH₂=C=CH₂, and HCN. SOLUTION
2. Determine the hybridization at each non-hydrogen atom. SOLUTION
3. Identify the AOs used to make each bond. SOLUTION
4. Predict the total number of MOs, include the total number of p MOs (if appropriate). SOLUTION
5. Sketch the MO diagram for each type of bond. SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the next lecture ;)