Question

1. provide the structural formulas for the following organic compounds:

a) 2,3 - dimethylbut - 2 - ene
b) 1 - bromo - 2 - iodo - cyclopentane
c) 1 - isobutylbenzene
d) 3 - bromo - 3 - t - butylhex - 1 - yne
e) 1 - ethyl - 3,4 - dimethylcyclohexane
f) 1 - iodo - 4isopropylhex - 1,3 - diene

Explanation:

Step1: Analyze 2,3 - dimethylbut - 2 - ene

The parent chain is but - 2 - ene (4 - carbon chain with a double bond at the second carbon). There are methyl groups at the 2nd and 3rd carbons. The structural formula is $CH_3C(CH_3)=C(CH_3)CH_3$.

Step2: Analyze 1 - bromo - 2 - iodo - cyclopentane

The parent is cyclopentane (a 5 - membered ring). There is a bromine atom at the 1st carbon and an iodine atom at the 2nd carbon. The structural formula is a 5 - membered ring with a Br on one carbon and an I on an adjacent carbon.

Step3: Analyze 1 - isobutylbenzene

The parent is benzene. The isobutyl group ($-CH_2CH(CH_3)_2$) is attached to the 1st carbon of the benzene ring. The structural formula is a benzene ring with $-CH_2CH(CH_3)_2$ attached to one of its carbons.

Step4: Analyze 3 - bromo - 3 - t - butylhex - 1 - yne

The parent is hex - 1 - yne (a 6 - carbon chain with a triple bond at the 1st carbon). There is a bromine and a t - butyl group ($-C(CH_3)_3$) at the 3rd carbon. The structural formula is $HC\equiv CCH(Br)C(CH_3)_3CH_2CH_3$.

Step5: Analyze 1 - ethyl - 3,4 - dimethylcyclohexane

The parent is cyclohexane (a 6 - membered ring). There is an ethyl group ($-CH_2CH_3$) at the 1st carbon and methyl groups at the 3rd and 4th carbons. The structural formula is a 6 - membered ring with $-CH_2CH_3$ on one carbon and two $-CH_3$ groups on adjacent carbons.

Step6: Analyze 1 - iodo - 4 - isopropylhex - 1,3 - diene

The parent is hex - 1,3 - diene (a 6 - carbon chain with double bonds at the 1st and 3rd carbons). There is an iodine atom at the 1st carbon and an isopropyl group ($-CH(CH_3)_2$) at the 4th carbon. The structural formula is $ICH_2CH=CHCH(CH(CH_3)_2)CH=CH_2$.

Answer:

a) $CH_3C(CH_3)=C(CH_3)CH_3$
b) A 5 - membered ring with a Br on one carbon and an I on an adjacent carbon
c) A benzene ring with $-CH_2CH(CH_3)_2$ attached to one of its carbons
d) $HC\equiv CCH(Br)C(CH_3)_3CH_2CH_3$
e) A 6 - membered ring with $-CH_2CH_3$ on one carbon and two $-CH_3$ groups on adjacent carbons
f) $ICH_2CH=CHCH(CH(CH_3)_2)CH=CH_2$