question_answer

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

A) Red, colourless, blue

B) Red, blue, colourless

C) Colourless, red, blue

D) Red, blue, violet

Correct Answer: B

Solution :

[b] Victor Meyer's test: The various steps involved are (i) \[RC{{H}_{2}}OH\xrightarrow{HI}RC{{H}_{2}}I\xrightarrow{AgN{{O}_{2}}}\] \[RC{{H}_{2}}N{{O}_{2}}\xrightarrow{HN{{O}_{2}}}\underset{Nitrolic\,acid}{\mathop{R-\underset{NOH}{\mathop{\underset{||}{\mathop{C}}\,}}\,-N{{O}_{2}}}}\,\xrightarrow{KOH}\] Blood red colour (ii)             (iii) \[{{R}_{3}}COH\xrightarrow{HI}{{R}_{3}}CI\xrightarrow{AgN{{O}_{2}}}\] \[{{R}_{3}}CN{{O}_{2}}\xrightarrow{HN{{O}_{2}}}No\,reaction\xrightarrow{KOH}Colourless\]