How will you carry out the following conversions: (Any two) (i) Propanal to Propane (ii) Ethanal to But-2-enal (iii) Ethanoic acid to ethanamide

(i) \(\displaystyle \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHO} \xrightarrow[\text { conc. } \mathrm{HCl}]{\mathrm{Zn}(\mathrm{Hg})} \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}\)

\(\displaystyle \rule{0pt}{1em}\)

(ii) \(\displaystyle \mathrm{CH_3CHO} \xrightarrow{\text{dil NaOH}} \mathrm{CH_3}\underset{\textstyle\underset{\textstyle\mathrm{OH}}{|}}{\mathrm{CH}}-\mathrm{CH_2}-\mathrm{CHO} \xrightarrow[-\mathrm{H_2O}]{\Delta} \mathrm{CH_3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CHO}\)

\(\displaystyle \rule{0pt}{1em}\)

(iii) \(\displaystyle \mathrm{CH_3COOH} \xrightarrow[\Delta]{\mathrm{NH_3}} \mathrm{CH_3CONH_2}\)