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Which of the following statements regarding peptide bond is correct?

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The peptide bond between carbon and nitrogen has a partial double bond character and the adjacent α carbons are cis to each other

The peptide bond between carbon and nitrogen has a pure single bond character and the adjacent α carbons are trans to each other.

The peptide double bond between carbon and nitrogen has a partial double bond character and the adjacent α carbons are trans to each other.

The peptide bond between carbon and nitrogen has a pure double bond character and the adjacent α carbons are cis to each other.

answer is C.

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Detailed Solution

A peptide bond has about 40% double-bond character because of electron delocalization. Steric hindrance causes the trans configuration to be more stable than the cis configuration, so the α-carbons of adjacent amino acids are trans to each other.

Hence, the correct answers are (3).

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