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1. How many structural isomers can you draw for pentane?
 
Pentane has structural isomers: neopentane, iso-pentane (methyl butane), and n-pentane (dimethylpropane). There are structural isomers that pentane can offer.
 
2. What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?
 
and (or the self-linking of carbon atoms to form long chains) are the two properties of carbon that lead to the synthesis of various carbon compounds.