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8.2 Organic chemistry isomerism — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry8.2 Organic chemistry isomerism1 Mark
MCQ
Which statement correctly completes the statement ?
Except for glycine, which is achiral, all the amino acids present in proteins ......
  • A
    are chiral, but racemic
  • ✓
    have the $L$ configuration at their $\alpha$ carbon
  • C
    have the $R$ configuration at their $\alpha$ carbon
  • D
    have the $S$ configuration at their $\alpha$ carbon
✓

Answer

Correct option: B.
have the $L$ configuration at their $\alpha$ carbon
b
$(b)$ Amino acids which combine into peptide chains to form the building blocks  of a rest array of proteins are all $L-$ stereoisomers (left handed) 
Glycine                                $NH_2 - CH_2 - COOH$

$L$-Amino acid                   $\begin{matrix}
   N{{H}_{2}}-CH-COOH  \\
   |\,\,\,\,\,\,\,\,\,\,  \\
   R\,\,\,\,\,\,\,\,\,\,  \\
\end{matrix}$

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