MCQ
Propanal on treatment with dilute sodium hydroxide forms
- A$C{H_3}C{H_2}C{H_2}C{H_2}C{H_2}CHO$
- B$C{H_3}C{H_2}CH(OH)C{H_2}C{H_2}CHO$
- ✓$C{H_3}C{H_2}CH(OH)CH(C{H_3})CHO$
- D$C{H_3}C{H_2}COONa$

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$1.\,Zn|Z{n^{2 + }}\,\left( {1\,M} \right)||C{u^{2 + }}\left( {1\,M} \right)|Cu$
$2.\,Zn|Z{n^{2 + }}\,\left( {0.1\,M} \right)||C{u^{2 + }}\left( {1\,M} \right)|Cu$
$3.\,Zn|Z{n^{2 + }}\,\left( {1\,M} \right)||C{u^{2 + }}\left( {0.1\,M} \right)|Cu$
are represented by $E_1,\,E_2,\,E_3$. Which of the following statement is true?