JEE Advanced 2013 Chemistry question
A tetrapeptide has –COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with – group attached to a chiral center is
Answer: 4
Solution
The free –COOH (C-terminus) is on alanine, so Ala is fixed at the last position; Gly, Val and Phe occupy the first three positions in 3! = 6 orders. The free –NH₂ (N-terminus) is on the first residue; it is attached to a chiral centre only if that residue is
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