Question

How do you convert Butane to but-1- ene? Or is there a way of converting chloroethane to but-1-ene?

Answer 1

Ethanol to but-1-yne

ethanol

CH

3

​

−CH

2

​

−OH

​

+SOCl

2

​

Pyridine

​

ethyl chloride

CH

3

​

−CH

2

​

−Cl

​

+SO

2

​

↑+HCl↑

acetylene

HC≡CH

​

+NaNH

2

​

liq.NH

3

​

​

sodium acetylide

HC≡C

−

Na

+

​

CH

3

​

−CH

2

​

−Cl+HC≡C

−

Na

+

→

but−1−yne

CH

3

​

−CH

2

​

−C≡CH

​

+NaCl

Answer 2

Here is your answer:

$CH_3-CH_2-CH_2-CH_3\:\:+\:\:Br_2$    $->$ $CH_2Br-CHBr-CH_2-CH_3$

$CH_2Br-CHBr-CH_2-CH_3 + KOH\:\:->CH_2=CHBr-CH_2-CH_3$

$CH_2=CHBr-CH_2-CH_3 + KOH->CHC-CH_2-CH_3$  (This is Butyne)$CHC-CH_2-CH_3 (Partial\:\: reduction)->CH_2=CH-CH_2-CH_3$

Converting chloroethane into butene

$2CH_3-CH_3-Cl + 2Na-> CH_3-CH_2-CH_2-CH_3$

$CH_3-CH_2-CH_2-CH_3\:\:+\:\:Br_2$    $->$ $CH_2Br-CHBr-CH_2-CH_3$

$CH_2Br-CHBr-CH_2-CH_3 + KOH\:\:->CH_2=CHBr-CH_2-CH_3$

$CH_2=CHBr-CH_2-CH_3 + KOH->CHC-CH_2-CH_3$  (This is Butyne)$CHC-CH_2-CH_3 (Partial\:\: reduction)->CH_2=CH-CH_2-CH_3$