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<p><strong>4 - metilbutana (salah)</strong></p><p>Metil = -CH3</p><p>Butana = 4 atom C ikatan rangkap 1</p><p>CH3-CH2-CH2-CH3 kemudian ditambah -CH3 diujung rantai, menjadi</p><p>CH3-CH2-CH2-CH3-<strong>CH3</strong> hal ini tidak memenuhi aturan penamaan karena CH3 tidak boleh ditengah atau harus diujung. Sehingga penamaaan yang benar adalah</p><p>CH3-CH2-CH2-CH2-CH3 atau Pentana</p><p><strong>2 - etilbutana (salah)</strong></p><p>Etil = -C2H5 atau -CH2-CH3</p><p>Butana = 4 atom C ikatan rangkap 1</p><p>CH3-CH-CH2-CH3</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|</p><p>&nbsp; &nbsp; &nbsp;&nbsp;<strong>C2H5</strong></p><p>Seharusnya, rantai terpanjangnya 5 atom C</p><p><strong>CH3</strong>-CH-CH2-CH3</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;CH2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;CH3</p><p>Sehingga penamaan yang tepat adalah 3-metilpentana</p><p><strong>2,2-dimetilbutana (benar</strong>)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<strong>CH3</strong></p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</p><p>CH3-CH2-CH2-CH3</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<strong>CH3</strong></p><p>Rantai terpanjang adalah 4 atom C</p><p><strong>3-metil-3-etilpentana (salah)</strong></p><p>Harusnya 3-etil-3-metilpentana karena nama cabang sesuai urutan abjad. Meskipun tidak ada kesalahan dalam struktur karena rantai terpanjang adalah 5 atom C ikatan rangkap 1 (Pentana) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<strong>C2H5</strong></p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</p><p>CH3-CH2-CH-CH2-CH3</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<strong>CH3</strong></p>