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