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  4. Why ethyl iodide becomes coloured when it is exposed to air?

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Q. Why ethyl iodide becomes coloured when it is exposed to air?

Rajasthan PMTRajasthan PMT 2004

Solution:

Alkyl iodides decompose in sunlight due to which they seem to be violet.
$2 C _{2} H _{5} I \ce{->[{ hv }]} C _{4} H _{10}+ I _{2}$