JEE Advance - Chemistry (2013 - Paper 1 Offline - No. 20)
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 $$-$$NH2 group attached to a chiral center is _______.
Answer
4
Explanation
The possible combinations with C-terminal as alanine and N-terminal with chiral carbon (i.e. excluding glycine) are four.
Val$$-$$Phe$$-$$Gly$$-$$Ala
Val$$-$$Gly$$-$$Phe$$-$$Ala
Phe$$-$$Val$$-$$Gly$$-$$Ala
Phe$$-$$Gly$$-$$Val$$-$$Ala
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