A) \[-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-\underset{\begin{smallmatrix} || \\ H \end{smallmatrix}}{\mathop{N}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-NH-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-NH-\]
B) \[-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,\]
C) \[-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-\]\[\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\]
D) \[-\underset{|}{\overset{|}{\mathop{C}}}\,-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\mathop{N}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,\]\[-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\]
Correct Answer: D
Solution :
The peptide linkage\[(-NH-CO-)\]is formed by the condensation of amino acids molecules. \[HNH\underset{\begin{smallmatrix} | \\ R \end{smallmatrix}}{\mathop{CH}}\,\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,OH\] \[+H.NH\underset{\begin{smallmatrix} | \\ R \end{smallmatrix}}{\mathop{CH}}\,\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,OH\xrightarrow[{}]{{}}\] \[-HN\underset{\begin{smallmatrix} | \\ R \end{smallmatrix}}{\mathop{CH}}\,\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,NH-\underset{\begin{smallmatrix} | \\ R \end{smallmatrix}}{\mathop{CH}}\,-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-\] Hence, following structure represents the peptide chain. \[-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,\underset{|}{\mathop{\overset{|}{\mathop{C}}\,}}\,\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,-\underset{|}{\mathop{\overset{|}{\mathop{C}}\,}}\,-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{N}}\,-\underset{|}{\mathop{\overset{|}{\mathop{C}}\,}}\,-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-\]
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