A tetrapeptide has –COOH group on alanine. This produce glycine (Gly) , Valine( Val) , phenyl alanine (phe) and alanine (Ala) on complete hydrolysis. For this tetra peptide, the number of possible sequences (primary structures) with $- N H_{2}$ group attached to a chiral centre is

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answer is 4.

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Detailed Solution

Since –COOH group is attached to alanine, one terminal of the tetrapeptide contains alanine. Thus its position is fixed
glycine-Achiral
$\begin{array}{l} v a l i n e \\ p h e n y l a l a n i n e \end{array}}$ chiral. Thus $- N H_{2}$ group attached to either valine (or) phenyl alanine
Possible combinations
$H_{2} N$ -val-Gly-phe-ala-COOH
$H_{2} N$ -val-phe-Gly-Ala-COOH
$H_{2} N$ -phe-Gly-val-Ala-COOH
$H_{2} N$ -phe-val-Gly-Ala-COOH