Q 21 :

Which is not true for arginine?           [2023]

• It has a fairly high melting point.

   

• It has high solubility in benzene.

   

• It is associated with more than one pKa values.

   

• It is a crystalline solid.

   

Q 22 :

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: A solution of the product obtained by heating a mole of glycine with a mole of chlorine in presence of red phosphorous generates chiral carbon atom.

Reason R: A molecule with 2 chiral carbons is always optically active.

In the light of the above statements, choose the correct answer from the options given below:               [2023]

• Both A and R are true but R is NOT the correct explanation of A.

   

• A is true but R is false

   

• A is false but R is true

   

• Both A and R are true and R is the correct explanation of A.

   

Q 23 :

Total number of tripeptides possible by mixing of valine and proline is ________.      [2023]

Q 24 :

A short peptide on complete hydrolysis produces 3 moles of glycine (G), two moles of leucine (L) and two moles of valine (V) per mole of peptide. The number of peptide linkages in it are ________.              [2023]

Q 25 :

In an oligopeptide named alanylglycylphenyl alanylisoleucine, the number of $s{p}^2$ hybridised carbons is ________.    [2023]