Learn the toughest concepts covered in Organic Chemistry with step-by-step video tutorials and practice problems by world-class tutors.

1. A Review of General Chemistry

Since we are going to be drawing A LOT of molecules over the next year, it makes sense to find an easier way to draw them. Hence, I now present to you š„ the skeletal structure!

*Also known as *bondline structure* or *line-angle* structure.Ā

**Carbons**are implied:Every corner is assumed to represent a carbon.**Hydrogens**are implied:Carbon is assumed to possess enough hydrogens to fill its octets.**Lone Pairs**are implied:Heteroatoms are assumed to possess enough electrons to fill their octets.**Formal Charges**are used to indicate when an atom does not satisfy its bonding preference.

**Watch Out:** ALL hydrogens on *heteroatoms* MUST be drawn explicitly.

1

How bondline is different from Lewis Structures.

4m

Play a video:

2

Conversion of ethanol from electron dot to bondline

1m

Play a video:

3

Problem

How many implied hydrogens does each labeled carbon have?

A

A=1; B=1; C=2

B

A=3; B=2; C=3

C

A=2; B=2; C=3

D

A=1; B=1; C=3

4

Problem

How many implied hydrogens does each labeled carbon have?

A

A=1; B=2; C=0; D=0

B

A=2; B=1; C=1; D=0

C

A=1; B=0; C=0; D=2

D

A=1; B=2; C=1; D=1

5

Problem

Convert the structure into a line-angle structure. Be sure to assign ** ALL** necessary formal and net charges.

A

B

C

D

6

Problem

Convert the structure into a line-angle structure. Be sure to assign ** ALL** necessary formal and net charges.

A

B

C

D

7

Problem

Convert the structure into a line-angle structure. Be sure to assign ** ALL** necessary formal and net charges.

A

B

C

D

Hint:Remember that you need to include formal charges if atoms are not at their bond preference.

8

Problem

** ALL** necessary formal and net charges.

A

B

C

D

We’ll be drawing these for the rest of the semester. Hope you liking them so far!