Starting from acetylene how will you obtain:
(i) Ethylidene iodide
(ii) Dichloro acetaldehyde
(iii) Ethylene?

Solution

(i) Ethylidene iodide. It is obtained by the action of acetylene with HI.

(ii) Dichloro acetaldehyde. Acetylene reacts with hypochlorous acid to form dichloro acetaldehyde
.

(iii) Ethylene. Acetylene reacts with hydrogen in the presence of Lindlar’s catalyst (Pd poisoned with CaCO₃) to form ethylene.

straight H minus stack straight C identical to straight C with Acetylene below minus straight H plus straight H subscript 2 space rightwards arrow with Pd divided by CaCO subscript 3 on top space stack CH subscript 2 space equals space CH subscript 2 with Ethylene below

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