MCQ
Zinc displaces copper from the solution of its salt because
  • A
    Atomic number of zinc is more than that of copper
  • B
    Zinc salt is more soluble in water than the copper salt
  • C
    Gibbs free energy of zinc is less than that of copper
  • Zinc is placed higher than copper in electro-chemical series

Answer

Correct option: D.
Zinc is placed higher than copper in electro-chemical series
d
(d)The reduction potential of $Zn$  is very higher than $ Cu.$

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Consider th following four reactions:

$(I)$ $\begin{array}{*{20}{c}}
  {{C_6}{H_5} - CH - Cl} \\ 
  {\,\,|} \\ 
  {\,\,\,\,\,\,\,\,\,C{H_3}} 
\end{array}\xrightarrow[{5\% \,\,water}]{{95\% \,\,\,acetone}}\begin{array}{*{20}{c}}
  {{C_6}{H_5} - CH - OH} \\ 
  | \\ 
  {\,\,\,\,\,\,C{H_3}} 
\end{array}$

$(II)$ $\begin{array}{*{20}{c}}
  {{C_6}{H_5} - CH - Cl} \\ 
  {\,\,|} \\ 
  {\,\,\,\,\,\,C{H_3}} 
\end{array}\xrightarrow[{10\% \,\,water}]{{90\% \,\,\,acetone}}\begin{array}{*{20}{c}}
  {{C_6}{H_5} - CH - OH} \\ 
  | \\ 
  {\,\,\,\,\,\,C{H_3}} 
\end{array}$

$(III)$ $\begin{array}{*{20}{c}}
  {{C_6}{H_5} - CH - Cl} \\ 
  {\,\,|} \\ 
  {\,\,\,\,\,\,C{H_3}} 
\end{array}\xrightarrow[{20\% \,\,water}]{{80\% \,\,\,acetone}}\begin{array}{*{20}{c}}
  {{C_6}{H_5} - CH - OH} \\ 
  | \\ 
  {\,\,\,\,\,\,C{H_3}} 
\end{array}$

$(IV)$ $\begin{array}{*{20}{c}}
  {{C_6}{H_5} - CH - Cl} \\ 
  {\,\,|} \\ 
  {\,\,\,\,\,\,C{H_3}} 
\end{array}\xrightarrow{{100\% \,water}}\begin{array}{*{20}{c}}
  {{C_6}{H_5} - CH - OH} \\ 
  | \\ 
  {\,\,\,\,\,\,C{H_3}} 
\end{array}$

Arrange these reactions in decreasing order of greater proportion of inverted product and select correct answer from the codes given below :