MCQ
Arrange their stabilities of given gem - dials in decreasing order.


- ✓$I > II > III$
- B$III > II > I$
- C$I > III > II$
- D$III > I > II$

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$(A)$ Upon heating, $H _3 PO _3$ undergoes disproportionation reaction to produce $H _3 PO _4$ and $PH _3$.
$(B)$ While $H _3 PO _3$ can act as reducing agent, $H _3 PO _4$ cannot.
$(C)$ $H _3 PO _3$ is a monobasic acid.
$(D)$ The $H$ atom of $P - H$ bond in $H _3 PO _3$ is not ionizable in water.

| List$-I$ | List$-II$ | ||
| $(a)$ | Sucrose | $(i)$ |
$\beta$ -D-Galactose and $\beta$ -D-Glucose |
| $(b)$ | Lactose | $(ii)$ | $\alpha$ -D-Glucose and $\beta$ -D-Fructose |
| $(c)$ | Maltose | $(iii)$ | $\alpha$ -D-Glucose and $\alpha$ -D-Glucose |
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