$$ \begin{array}{|c|c|} \hline \text { (Y) } & \text { (Sequence) } \\ \hline \hline \text { Serine } & \text { Thr-Ser-Asp-Ala-Gly } \\ \hline \end{array} $$

$$ \begin{array}{|c|c|} \hline \text { (Y) } & \text { (Sequence) } \\ \hline \hline \text { Serine } & \text { Ser-Asp-Thr-Ala-Gly } \\ \hline \end{array} $$

$$ \begin{array}{|c|c|} \hline \text { (Y) } & \text { (Sequence) } \\ \hline \hline \text { Threonine } & \text { Ser-Thr-Asp-Gly-Ala } \\ \hline \end{array} $$

$$ \begin{array}{|c|c|} \hline \text { (Y) } & \text { (Sequence) } \\ \hline \hline \text { Threonine } & \text { Thr-Ser-Asp-Gly-Ala } \\ \hline \end{array} $$

400, 300

600, 400

500, 200

300, 200

$\frac{5 \mathrm{R}}{36}, \frac{3 \mathrm{R}}{16}, \frac{21 \mathrm{R}}{100}$

$\frac{7 \mathrm{R}}{144}, \frac{3 \mathrm{R}}{16}, \frac{16 \mathrm{R}}{255}$

$\frac{3 \mathrm{R}}{4}, \frac{3 \mathrm{R}}{16}, \frac{7 \mathrm{R}}{144}$

$\frac{5 \mathrm{R}}{36}, \frac{8 \mathrm{R}}{9}, \frac{15 \mathrm{R}}{16}$

Compound y will dissolve in $\mathrm{NaHCO}_3$ and evolve a gas.

Compound x is more acidic than compound y .

Both compounds x and y will dissolve in NaOH .

Both compounds x and y will burn with sooty flame.