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(D) The qualitative analysis results are as follows:$(i)$ Fehling's test is positive for aliphatic aldehydes. Aromatic aldehydes and heterocyclic alde

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$2-$(Thiazol$-2-$yl)acetaldehyde

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(D) The qualitative analysis results are as follows:$(i)$ Fehling's test is positive for aliphatic aldehydes. Aromatic aldehydes and heterocyclic aldehydes where the $-CHO$ group is directly attached to the ring (like in $A, B, C$) do not give a positive Fehling's test due to resonance stabilization. Only $D$ ($2$-(thiazol$-2-$yl)acetaldehyde) has the $-CHO$ group separated from the ring by a $-CH_2-CH_2-$ chain,making it behave like an aliphatic aldehyde,thus giving a positive Fehling's test.$(ii)$ The formation of a blood-red colour with sodium nitroprusside in the $Na$ fusion extract indicates the presence of both Nitrogen $(N)$ and Sulfur $(S)$ in the compound. Among the options,only $C$ and $D$ contain both $N$ and $S$. Combining both observations,only compound $D$ satisfies both conditions.

Which of the following compounds would give the following set of qualitative analysis?
$(i)$ Fehling's Test : Positive
$(ii)$ $Na$ fusion extract upon treatment with sodium nitroprusside gives a blood red colour.

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Which of the following compounds would give the following set of qualitative analysis?$(i)$ Fehling's Test : Positive$(ii)$ $Na$ fusion extract upon treatment with sodium nitroprusside gives a blood red colour.