
- A

- ✓

- C

- D








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$C{H_3} - COOH\xrightarrow{{N{H_3}}}A\xrightarrow{\Delta }B\xrightarrow[{B{r_2}}]{{KOH}}C$
$\mathrm{H}_3 \mathrm{PO}_4 \ \ \ \ \mathrm{H}_2 \mathrm{SO}_4 \ \ \ \ \mathrm{H}_3 \mathrm{PO}_3 \ \ \ \ \mathrm{H}_2 \mathrm{CO}_3 \ \ \ \ \mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7 $
$ \mathrm{H}_3 \mathrm{BO}_3 \ \ \ \ \mathrm{H}_3 \mathrm{PO}_2 \ \ \ \ \mathrm{H}_2 \mathrm{CrO}_4 \ \ \ \ \mathrm{H}_2 \mathrm{SO}_3 $
$CH_3CH_2CH_2CONH_2$ $\mathop {\xrightarrow{{Ca{{(OH)}_2},C{l_2}}}}\limits_\Delta X\xrightarrow{{HN{O_2}}}Z$
$A$. has been used in spaceship
$B$. has as efficiency of $40 \%$ to produce electricity
$C$. uses aluminium as catalysts
$D$. is eco-friendly
$E$. is actually a type of Galvanic cell only