Isobutyl

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Isobutyl (Common Name) or 2-Methylpropyl (IUPAC) is a substituent group with the formula C4H9. As the IUPAC name suggests, it is composed of a propyl chain with its own methyl substituent attached to the second carbon atom.

The Lewis structure is as follows:

      H     H     H
      |     |     |
  R---C-----C-----C--H
      |     |     |
      H   H-C-H   H
            | 
            H