Question

how to convert ethylene to acetylene

Answer 1

first step bromination to get vic 1,2 ~dibromo ethane folliwed by dehydrohalogenation by boiling with alcohalc KOH
I hope this will help u

Answer 2

$\huge\mathfrak\orange {Hello\:Mate}$

$\huge\boxed{\large\boxed{\large\boxed{\blue{♡ANSWER♡}}}}$

Hmm lets give this a try !!

Method (1)

Reaction of acetylene with H2O in presence of H2SO4 and HgSO4 to give acetaldehyde :O (Single Step Process )

Method (2)

1 Reaction with LiALH4 to give Ethane

2 Reaction with Cl2 in presence of sunlight to give out Chloroethane

3 Reaction with Aq KOH to give out Ethanol

4 Reaction with PCC to produce acetaldehyde

Method (3)

1 Reaction of acetylene with HCl to give ChloroEthene

2 Reaction of Aq KOH to give Ethenol

3 Tautomerism will produce Acetaldehyde

Tho Method 3 is less productive as the step 2 can produce other compounds too

$\huge\mathbb\green {♡Jai\:Hind♡}$