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(D) From the reaction $A + Na_2S_2O_3 \rightarrow B + Na_2S_4O_6$,$A$ is $I_2$ and $B$ is $NaI$.From the reaction $C + A \rightarrow B_2H_6 + B + H_2$

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Compound $B$ gives a blue colour solution with starch.

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(D) From the reaction $A + Na_2S_2O_3 \rightarrow B + Na_2S_4O_6$,$A$ is $I_2$ and $B$ is $NaI$.From the reaction $C + A \rightarrow B_2H_6 + B + H_2$,where $A = I_2$ and $B = NaI$,$C$ is $NaBH_4$.$NaBH_4 + I_2 \rightarrow B_2H_6 + NaI + H_2$.$B_2H_6 + NaH \rightarrow NaBH_4$ $(C)$.Now evaluating the options:$A$. $B$ $(NaI)$ is soluble in water and the solution is colourless,not brown.$B$. Compound $C$ $(NaBH_4)$ contains ionic ($Na^+$ and $[BH_4]^-$) and covalent bonds (within $[BH_4]^-$),not coordinate bonds.$C$. Aqueous solution of $B$ $(NaI)$ does not give a brown layer in the layer test.$D$. Compound $B$ $(NaI)$ does not react with starch to give a blue colour. However,if $A$ $(I_2)$ is present,it gives a blue colour with starch. Re-evaluating the reaction: $I_2$ reacts with starch to give a blue colour. Given the options,there might be a typo in the question's premise regarding $B$. Based on standard chemistry,$I_2$ is the species that gives a blue colour with starch.

Based on the given reaction scheme,identify which of the following statements is $CORRECT$?
$C + A \rightarrow B_2H_6 + B + H_2$
$B_2H_6 + NaH \rightarrow C$
$A + Na_2S_2O_3 \rightarrow B + Na_2S_4O_6$

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Based on the given reaction scheme,identify which of the following statements is $CORRECT$?$C + A \rightarrow B_2H_6 + B + H_2$$B_2H_6 + NaH \rightarrow C$$A + Na_2S_2O_3 \rightarrow B + Na_2S_4O_6$