Q25 / 160 · TS EAMCET 2023 (14 May Shift 1) · Chemistry
$$
\begin{aligned}
& \mathrm{P}_4+3 \mathrm{NaOH}+3 \mathrm{H}_2 \mathrm{O} \stackrel{\mathrm{CO}_2}{\longrightarrow} 3 \mathrm{X}+\mathrm{PH}_3 \uparrow \\
& \mathrm{X} \stackrel{\mathrm{HCl}(\mathrm{aq})}{\longrightarrow} \mathrm{Y}+\mathrm{NaCl}
\end{aligned}
$$
The incorrect statement about $\mathrm{Y}$ is
- Correct answerAIt is also called phosphonic acid
- BIt is a monobasic acid
- CIt is a reducing agent
- DOxidation state of the central atom in it is +1
Solution
$\mathrm{P}_4+3 \mathrm{NaOH}+3 \mathrm{H}_2 \mathrm{O} \stackrel{\mathrm{CO}_2}{\longrightarrow} 3 \mathrm{NaH}_2 \mathrm{PO}_2+\mathrm{PH}_3$
(X)
$$
\mathrm{NaH}_2 \mathrm{PO}_2 \stackrel{\mathrm{HCl}(\mathrm{aq} \text {.) }}{\longrightarrow} \mathrm{H}_3 \mathrm{PO}_2+\mathrm{NaCl}
$$
(Y)
The name of $\mathrm{H}_3 \mathrm{PO}_2$ is hypophosphorous acid or phosphinic acid and not phosphoric acid.
Hence, the correct answer is option: 'A'.