# Is 1-methylpropane a correct way of naming butane?

Mar 11, 2017

No, because it IS butane.

1-methylpropane says that:

• Three carbons are in the main chain ("prop-").
• One methyl group ($\text{H"_3"C} -$) is attached to carbon-1 ("1-methyl")

$\textcolor{w h i t e}{\ldots . .} {\text{CH}}_{3}$
$\textcolor{w h i t e}{a \ldots .} |$
${\text{H"-"C"-"CH"_2-"CH}}_{3}$
$\textcolor{w h i t e}{a \ldots .} |$
$\textcolor{w h i t e}{a a a} \text{H}$

But that's the same as simply having four carbons in a row and bonding each of them with the appropriate number of hydrogen atoms.

${\text{H"_3"C"-"CH"_2-"CH"_2-"CH}}_{3}$

Thus, they are not different isomers (whether they're constitutional, conformational, stereochemical, etc). They are identical compounds.