In the Victor-Meyer's test, the colour given by $1^{\circ} .2^{\circ}$ and $3^{\circ}$ alcohols are respectively:

• A

  Red, colourless, blue
• Correct answer
  B

  Red, blue, colourless
• C

  Colourless, red, blue
• D

  Red, blue, violet

Solution

Victor Meyer's test: The various steps involved are (i)$\mathrm{RCH}_2 \mathrm{OH} \xrightarrow{\mathrm{HI}} \mathrm{RCH}_2 \mathrm{I} \xrightarrow{\mathrm{AgNO}_2} \mathrm{RCH}_2 \mathrm{NO}_2$ (ii)
(iii) $\mathrm{R}_3 \mathrm{COH} \xrightarrow{\mathrm{HI}} \mathrm{R}_3 \mathrm{CI} \xrightarrow{\mathrm{AgNO}_2} \mathrm{R}_3 \mathrm{CNO}_2$ $-\xrightarrow{\mathrm{HNO}_2}$ No reaction $\xrightarrow{\mathrm{KOH}}$ Colourless

Hence, the correct answer is option: 'B'.