Question

Illustrate  the different structural  isomers  of  the following molecules.

1. C6H14

2. C5H11Cl

3. C7H7I

containing benzene

ring

4. C4H8O

5. C4H8O2

Answer 1

1. The isomers of C6H14 are;

(a) 2-methylpentane.

CH3 CH(CH3) CH3 CH3 CH3

(b) 2,3-dimethylbutane

CH3 CH(CH3) CH (CH3)

(c) 2,2-dimethylbutane

CH3 C(CH3)2 CH2 CH3

(d) n-hexane

CH3 CH2 CH2 CH2 CH2 CH3

2. The isomers of C5H11Cl are;

(a) 1-chloropentane

CH2(Cl) CH2 CH2 CH2 CH3

(b) 2-chloropentane

CH3 CH(Cl) CH2 CH2 CH3

(c) 3-chloropentane

CH3 CH2 CH(Cl) CH2 CH3

(d) 1-chloro-2-methylbutane

CH2(Cl) CH(CH3) CH2 CH3

(e) 1-chloro-3-methylbutane

CH(Cl) CH2 CH(CH3) CH3

(f) 2-chloro-3-methylbutane

CH3 CH(Cl) CH(CH3) CH3

(g) 1-chloro-2,2-dimethylpropane

CH(Cl) C(CH3)2 CH3

3. Isomers of C7H7I

(a) 1-iodo-2-methylbenzene

(b) 1-Iodo-3-methylbenzene

(c) 1-iodo-4-methylbenzene

(d) iodomethyl benzene

4. Isomers of C4H8O

(a) Butanal

CH3 CH2 CHO

(b) 2-butanone

CH3COOCH2CH3

(c)Cyclobutanol

CH2CHOHCH2CH2

(d) 1,2-epoxybutane

CH2OCHCH2CH3

(e) Cis-2,3epoxybutane

(f) trans-2,3 epoxybutane

(g) 2-buten-1-ol

Ch3CH=CHCH2OH

(h) 3-buten-1-ol

CH2=CHCH2CH2OH

5. Isomers of C4H8O2 are:

(a) N-propylmethanoate

HCOOCH(CH3)2

(b) Isopropyl formate

HCOOCH(CH3)2

(c) Ethyl acetate

CH3COOCH2CH3

(d) methyl propionate

CH3CH2COOCH3