# How to prepare ethane from ehanoic acid??

Jun 6, 2018

This way possibly.

#### Explanation:

Step 1:

We can reduce the acid by lithium tetrahydrido aluminate in dry ether -diethyl ether- ($L i A l {H}_{4}$)to get ethanol.

$C {H}_{3} C O O H$ + 4[H]----> $C {H}_{3} C {H}_{2} O H$ + ${H}_{2} O$

(P.S. $L i A l {H}_{4}$ was represented as [H] to simplify balancing of equations. And this is generally how we represent the action of reducing agents in organic chemistry.)

Step 2:

Ethanol can be dehydrated by heating it with concentrated sulfuric acid or passing its vapors over hot aluminium oxide to get ethene. This is an elimination reaction.

$C {H}_{3} C {H}_{2} O H$ -----> ${C}_{2} {H}_{4}$ + ${H}_{2} O$

(P.S. Concentrated sulfuric acid- ${H}_{2} S {O}_{4}$ - or Aluminium oxide - $A {l}_{2} {O}_{3}$ - is used as a catalyst.)

Step 3:

Ethene can be reduced by Hydrogen in the presence of nickel catalyst at 140 degrees Celsius to get ethane. This is also an addition reaction.

${C}_{2} {H}_{4}$ + ${H}_{2}$ ----> ${C}_{2} {H}_{6}$