A student performed analysis of aliphatic organic compound ' $X$ ' which on analysis gave $C=61.01 \

Question

A student performed analysis of aliphatic organic compound ' $X$ ' which on analysis gave $C=61.01 \%$, $\mathrm{H}=15.25 \%, \mathrm{~N}=23.74 \%$.
This compound, on treatment with $\mathrm{HNO}_2 / \mathrm{H}_2 \mathrm{O}$ produced another compound ' Y ' which did not contain any nitrogen atom. However, the compound ' $Y$ ' upon controlled oxidation produced another compound ' $Z$ ' that responded to iodoform test.
The structure of ' X ' is :

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