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What is the difference between isobutane and n-butane ?
I want to show you a simple mnemonic to identify iso alkanes.
If you look at structural formulas of several iso alkanes what you will find is that all of them have a Y-shaped end . Just have a look at them:
You can easily see the red Y-s in their structural formulas.
So, when you see an isoalkane, think Ysoalkane . And, of course, I'm delibarately misspelling the word in order to create a good link inside my head. This is how mnemonic devices work!
Note: the official IUPAC-names would be methyl-propane, 2-methyl-butane and 2-methyl-pentane respectively, but the iso-names are still 'tolerated'.