About Lesson
RULES FOR NAMING ORGANIC COMPOUND WITH FUNCTIONAL GROUP
- Select longest chain containing functional group.
- Numbering is done in such a way that Carbon atom with functional group gets lowest number.
- Rules for naming substituent are same.
- The 2 or more functional groups are indicated by di, tri etc.
- While numbering the preference is given as: –
Functional Group > Double Bond> Triple Bond> Side Chain
- If different functional groups are present that preference for considering main functional group is give as shown:
COOH > ester> acid halide> amide>CN>CHO>C>OH>amines>ether
- One functional group is treated as main group.
- Other functional group (treated as substituent according to preference)
PREFIX USED FOR SECONDARY FUNCTIONAL GROUP
![](http://free-education.in/wp-content/uploads/2021/04/8-1.jpg)
![Organic Chemistry Class 11th Chapter 12 Notes and NCERT Solution. Class 11th Chapter wise Notes and NCERT solution for students](http://free-education.in/wp-content/uploads/2021/04/image-389.png)
NOMANCLATURE OF AROMATIC COMPOUNDS
Aromatic compounds are those which contain at least one benzene ring.
BENZENE – Hexagon of Carbon atoms with 3 alternate double Bonds.
![](http://free-education.in/wp-content/uploads/2021/04/10-1.jpg)
![Organic Chemistry Class 11th Chapter 12 Notes and NCERT Solution.](http://free-education.in/wp-content/uploads/2021/04/image-390.png)
Aryl group :- radicals obtained by removal of one or more H atom of
aromatic compounds.
![Organic Chemistry Class 11th Chapter 12 Notes and NCERT Solution.](http://free-education.in/wp-content/uploads/2021/04/image-392.png)
Rules
- When benzene ring is used as substituent, it is named as phenyl (ph).
- Numbering can be done from any side.
- Substituents are written in alphabetical order.
![Organic Chemistry Class 11th Chapter 12 Notes and NCERT Solution.](http://free-education.in/wp-content/uploads/2021/04/11-3.jpg)
Write Structures of :
![Organic Chemistry Class 11th Chapter 12 Notes and NCERT Solution.](http://free-education.in/wp-content/uploads/2021/04/12-3.jpg)
![](http://free-education.in/wp-content/uploads/2021/04/13-2.jpg)
![Organic Chemistry Class 11th Chapter 12 Notes and NCERT Solution.](http://free-education.in/wp-content/uploads/2021/04/14-2.jpg)
![Organic Chemistry Class 11th Chapter 12 Notes and NCERT Solution.](http://free-education.in/wp-content/uploads/2021/04/15-2.jpg)