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How many constitutional isomers does C3H8O have?
3 isomers
##C_3H_8O## has three constitutional isomers:
1-propanol: ##CH_3-CH_2-CH_2-OH##
2-propanol: ##CH_3-CH(OH)-CH_3##
ethyl-methyl ether: ##CH_3-CH_2-O-CH_3##
There are no geometric isomers or stereoisomers posssible for these structures