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7. Alcohol, phenol and ethers — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry7. Alcohol, phenol and ethers1 Mark
MCQ
$1^o, 2^o, 3^o$ alcohols are distinguished by
  • A
    Oxidation method
  • B
    Lucas test
  • C
    Victor-Meyer's method
  • ✓
    All of the above
✓

Answer

Correct option: D.
All of the above
d
Primary, secondary and tertiary alcohols are distinguished by, oxidation method, Lucas test, and Victor Meyer's method.

Oxidation method :

Primary alcohols on oxidation by a suitable oxidizing agent $Na _2 Cr _2 O _7$ sodium dichromate produces aldehydes which can be further oxidized to carboxylic acids, whereas the secondary alcohol on oxidation will produce ketones and have no tendency to undergo further oxidation, and tertiary alcohols are not oxidized by acidified sodium or potassium dichromate $(VI)$ solution.

Lucas test:

It is based on the difference in three types of alcohols towards Lucas reagent ( a mixture of conc. $HC1$ ) and anhydrous $ZnCl _2$ at room temperature.

Victor Meyer's method:

In this test an unknown alcohol is converted into the corresponding nitro alkane which is then treated with nitrous acid followed by alkalizing the solution.

Primary alcohol gives blood-red colour, secondary alcohol gives blue and tertiary alcohol remains colourless.

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