Question

1)Prepare n-butanyl bromide from n-butane
2)Prepare Ethyl bromide from n-butane
3)Prepare 1-Butanol from n-butane
4)Prepare 2-Butene from n-butane

Answer 1

1) CH3-CH2-CH2-CH3 + Cl2 ---> CH3-CH2-CH2-CH2-Cl + HCl

CH3-CH2-CH2-CH2-Cl + KOH (dry) --> CH3-CH2-CH2=CH2

CH3-CH2-CH2=CH2 + Br2/H2O2 --> CH3-CH2-CH2-CH2-Br

CH3-CH2-CH2-CH2-Br + KOH (aq) --> CH3-CH2-CH2-CH2-OH + KBr

CH3-CH2-CH2-CH2-OH + NaBr/H2SO4 --> CH3-CH2-CH2-CH2-Br + H2O + NaHSO4

2) CH3-CH2-CH2-CH2-Br + KOH (dry) --> CH3-CH2-CH2=CH2

CH3-CH2-CH2=CH2 + H2 --> CH3-CH2-CH2-CH3 (kat)

CH3-CH2-CH2-CH3 ----> CH3-CH=CH-CH3 + H2 (Cr2O3 300-400 C)

CH3-CH=CH-CH3 + [O*] + H2O --> 2C2H5OH

C2H5OH + POBr3 --> C2H5Br (in pyridine)

3) CH3-CH2-CH2-CH3 + Cl2 ---> CH3-CH2-CH2-CH2-Cl + HCl

CH3-CH2-CH2-CH2-Cl + KOH (dry) --> CH3-CH2-CH2=CH2

CH3-CH2-CH2=CH2 + Br2/H2O2 --> CH3-CH2-CH2-CH2-Br

CH3-CH2-CH2-CH2-Br + KOH (aq) --> CH3-CH2-CH2-CH2-OH + KBr

4) CH3-CH2-CH2-CH3 ----> CH3-CH=CH-CH3 + H2 (Cr2O3 300-400 C)