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Write Victor Meyer's test to distinguish...

Write Victor Meyer's test to distinguish between `1^@, 2^@ and 3^@` alcohols ?

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Victor Meyer.s test involves the following steps:
1. Treat the given alcohol with red phosphors and iodine to get alkyl iodide.
2. Treat the alkyl iodide with silver nitrite to get nitro alkane
3. Treat the nitroalkane with nitrous acid `(NaNO_2+"dil" H_2SO_4)` and make the
(a) A blood red colour indicates a `1^@` alcohol.
(b) A blue colour indicates a `2^@` alcohol.
(c) A colourless solution indicates a `3^@` alcohol.
The different reations taking place are as follows:
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