| I. \[C{{H}_{3}}\overset{O}{\mathop{\overset{|\,|}{\mathop{C}}\,}}\,C{{H}_{3}}\xrightarrow[\Delta .{{H }^{+}}]{{{I}_{2}}/NaOH}\] |
| II. \[C{{H}_{3}}\overset{O}{\mathop{\overset{|\,|}{\mathop{C}}\,}}\,C{{H}_{3}}\xrightarrow{C{{r}_{2}}O_{7}^{2-}/{{H}^{+}}}\] |
| III. \[C{{H}_{3}}\overset{O}{\mathop{\overset{|\,|}{\mathop{C}}\,}}\,C{{H}_{3}}\xrightarrow{Ag(N{{H}_{3}})_{2}^{+}}\] |
A) I, III
B) II, III
C) I, II
D) I, II, III
Correct Answer: C
Solution :
Methyl ketones \[(C{{H}_{3}}\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,R)\] react rapidly with halogens, \[(C{{l}_{2}},B{{r}_{2}},{{I}_{2}})\]in presence of alkali to form haloform. \[C{{H}_{3}}\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,C{{H}_{3}}+3{{l}_{2}}+4NaOH\xrightarrow{{}}\] \[C{{H}_{3}}\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-ONa+CH{{l}_{3}}+3Nal+3{{H}_{2}}O\] \[C{{H}_{3}}\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-ONa+{{H}^{+}}\xrightarrow[-N{{a}^{+}}]{\Delta }C{{H}_{3}}\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,OH\] (II) Stronger oxidizing agents oxidize ketones to carboxylic acids. \[C{{H}_{3}}\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,C{{H}_{3}}\xrightarrow{{{K}_{2}}C{{r}_{2}}{{O}_{7}}+{{H}_{2}}S{{O}_{4}}}\] \[C{{H}_{3}}\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,H+H\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,OH\] (III) Tollens reagent (ammonical silver nitrate solution), being weak oxidizing agent cannot reduce acetone into acetic acid. \[C{{H}_{3}}\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,C{{H}_{3}}+[Ag(N{{H}_{3}})_{2}^{+}]\xrightarrow{{}}\text{No}\,\text{reaction}\]f=
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