Lucas test is used to make distinction between \( 1^{\circ}, 2^{\circ} \) and \( 3^{\circ} \) al...
0Lucas test is used to make distinction between \( 1^{\circ}, 2^{\circ} \) and \( 3^{\circ} \) alcohols:
\[
\mathrm{ROH}+\underset{\text { conc. }}{\mathrm{HCl}} \stackrel{\text { anhydrous } \mathrm{ZnCl}_{2}}{\longrightarrow} \underset{\text { White turbidity }}{\mathrm{RCl} \downarrow}+\mathrm{H}_{2} \mathrm{O}
\]
This shows that
(a) \( \mathrm{ROH} \) behaves as a base.
(b) Greater the value of \( \mathrm{pK}_{\mathrm{a}}(a \) lcohol), greater the reactivity with conc. \( \mathrm{HCl} \) and thus sooner the formation of white turbidity.
(c) Alcohol which reacts fastest with Na metal, will give turbidity at fastest rate.
(d) Alcohol which gives red colour during Victor Meyer test, will give turbidity at slower rate than those giving blue or white colour during Victor Meyer test.
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