Question

Number the carbon atoms in the main chain of the above compound given above. Put a tick mark against the correct position numbers of the branches.

$$CH_3 - CH_2 - \overset{CH_3}{\overset{\!\!\!\!\!|}{CH}} - CH_2 - \underset{CH_3}{\underset{\!\!\!\!\!|}{CH}} - CH_3$$
a. What is the IUPAC name?
b. Which is the second branch?

Answer 1

$$\cdot$$ Number of carbon atoms in the main chain: $$5$$
$$\cdot$$ Number of branch/branches: $$2$$
$$\cdot$$ Position of the first branch while numbering from left to right: $$2$$
$$\cdot$$ Position of the first branch while numbering from right to left: $$2$$

So, the IUPAC name: $$2,4$$ dimethyl pentane

Both branches are of methyl group.

Hence,

a. $$2, 4$$- Dimethyl hexane.
b. $$CH_3$$