Which position for hydrogen explains all its properties?

$TiH_{1.73}$ is an example of

$H_2C_2O_4 \xrightarrow{\Delta} \text{gas } (A) + \text{gas } (B) + \text{liquid } (C)$.
Gas $(A)$ burns with a blue flame and is oxidised to gas $(B)$.
Gas $(A) + Cl_2 \to (D)$.
$A, B$ and $D$ are:

Which hydride among the following is less stable?

Dihydrogen reacts with dioxygen $(O_2)$ to form water. Write the name and formula of the product when the isotope of hydrogen which has one proton and one neutron in its nucleus is treated with oxygen. Will the reactivity of both the isotopes be the same towards oxygen? Justify your answer.

Which is distilled first?