Question

how are the iso-alkane branches of compounds written in condensed formula like iso-butyl?

Answer 1

Answer:

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• In organic chemistry, butyl is a four-carbon alkyl radical or substituent group with general chemical formula −C4H9, derived from either of the two isomers of butane.

• The isomer n-butane can connect in two ways, giving rise to two "-butyl" groups:

• If it connects at one of the two terminal carbon atoms, it is normal butyl or n-butyl: CH3−CH2−CH2−CH2− (fully systematic name: butyl)
• If it connects at one of the non-terminal (internal) carbon atoms, it is secondary butyl or sec-butyl: CH3−CH2−CH(CH3)− (fully systematic name: 1-methylpropyl)