Observe the table below:

Structure	Molecular formula	Name
	${\mathrm{CH}}_4$	Methane
	${\mathrm{C}}_2{\mathrm{H}}_6$	Ethane
	${\mathrm{C}}_3{\mathrm{H}}_8$	Propane

Have you seen any special features in these names? How the names are derived from the word roots?

Write the IUPAC name of all the alkanes.

Which of these chains has the lowest number of carbon atom carrying the branch?

a. Number for the carbon atom carrying the branch?
b. Number of carbon atoms in the main chain.
c. Word root
d. Suffix
e. Name of the alkyl radical coming as branch.
f.  Position of the branch.

Write the IUPAC name of the given hydrocarbons by identifying the longest chains and the position of the branch.

Some structural formulas are given below. Name them.

(i) Number of carbon atoms in the main chain: 

(ii) Number of branch/branches: 

(iii) Position of the first branch while numbering from left to right: 

(iv) Position of the first branch while numbering from right to left: 

(v) Is there any change in the position number: 

(vi) IUPAC name: 

(i) Number the carbon atoms in the main chain of the compound given above. Select the correct position numbers of the branches.

(ii) IUPAC name_____

a. Write the IUPAC name of the compound?

b. Which is the second branch?

c. When does this branch get the lowest number? Select the correct one.
(i) While numbering from left to right
(ii) While numbering from right to left

Write the IUPAC name of the compound given below.

See the given compound

(i) Number of branches present in this compound
(ii) Names of the branches
(iii) Position numbers of branches
(iv) IUPAC name