Ligninde bulunan fonksiyonel gruplar şunlardır: 1. Metoksifenolik hidroksil grupları. 2. Aldehit grupları. 3. Eter grupları. Ayrıca, lignin polimerik yapısı içinde sülfon grupları da bulunur.
Alkanlarda görülen izomerler şunlardır: Yapı izomerleri. Konum izomerleri. Zincir-dal izomerleri. Zincir-halka izomerleri. Alkanların ilk 3 üyesi olan metan (CH4), etan (C2H6) ve propan (C3H8) izomeri görülmez.
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