(d)Undecane is the unbranched alkane with 11 carbon atoms, undecanoic acid is the correspond-ing carboxylic acid, andundecenoic acidis an 11-carbon carboxylic acid that contains adouble bond. Because the carbon chain is numbered beginning with the carboxyl group,10-undecenoic acid has its double bond at the opposite end of the chain from the carboxyl group.(e)Mevalonic acid has a five-carbon chain with hydroxyl groups at C-3 and C-5, along with amethyl group at C-3.(f)The constitution represented by the systematic name 2-methyl-2-butenoic acid gives rise totwo stereoisomers.Tiglic acid is the Eisomer, and the Zisomer is known as angelic acid.The higher ranked sub-stituents, methyl and carboxyl, are placed on opposite sides of the double bond in tiglic acidand on the same side in angelic acid.(g)Butanedioic acid is a four-carbon chain in which both terminal carbons are carboxylic acid
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