Question

Combine the proper prefix, infix, and suffix, and write the IUPAC name for each compound: (a) \(\mathrm{CH}_{3} \mathrm{CCH}_{3}\) (b) \(\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{3}{ }_{\mathrm{CH}}^{\|}\) (c) OC1CCCC1 (d) C1=CCCCCC1

Short answer

Answer: The IUPAC names of the given compounds are: (a) 2-methylpropane, (b) pent-1-ene, (c) hydroxycyclopentane, and (d) cyclohepta-1,3,5-triene.

Step-by-step solution

(Identifying the Main Carbon Chain and Substituents for Compound (a))

First, let's identify the main carbon chain and any substituents in the compound (a): \(\mathrm{CH}_{3} \mathrm{CCH}_{3}\). We can see that this compound has three carbon atoms present, with no branching or functional groups, making it an alkane. The main carbon chain is three carbons long, with a methyl group as a substituent on the middle carbon.

(Naming Compound (a))

To name this compound, we will use the appropriate prefix for the number of carbons (3 carbons: "prop"), the infix for alkanes ("-an"), and the location and name of the substituent (methyl). The IUPAC name for compound (a) is 2-methylpropane.

(Identifying the Main Carbon Chain and Substituents for Compound (b))

For compound (b): \(\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{3}{ }_{\mathrm{CH}}^{\|}\), we see that there are five carbon atoms present in an unbranched chain, which makes it an alkene since the double bond between the first and second carbons is present.

(Naming Compound (b))

To name this compound, we will use the appropriate prefix for the number of carbons (5 carbons: "pent"), the infix for alkenes ("-en"), and the location of the double bond (between carbons 1 and 2). The IUPAC name for compound (b) is pent-1-ene.

(Identifying the Main Carbon Chain and Substituents for Compound (c))

For compound (c): OC1CCCC1, we see that there is a 5-membered carbon ring (cyclopentane) with an alcohol functional group (-OH) attached to one of the carbons in the ring.

(Naming Compound (c))

To name this compound, we will use the cyclopentane as the root and add the alcohol functional group as a prefix (hydroxy-). Since there is only one possible location for the hydroxy group in a 5-membered ring, we do not need to number the carbons. The IUPAC name for compound (c) is hydroxycyclopentane.

(Identifying the Main Carbon Chain and Substituents for Compound (d))

For compound (d): C1=CCCCCC1, we see that there is a 7-membered carbon ring with alternating single and double bonds, which makes this compound a cycloalkene.

(Naming Compound (d))

To name this compound, we will use the appropriate prefix for the number of carbons (7 carbons: "hept"), the infix for the alternating double bonds ("-a"), the cyclic structure ("-cyclo"), coupled with the "-ene" suffix for alkenes. The IUPAC name for compound (d) is cyclohepta-1,3,5-triene.