The substituents R_1 and R_2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at pH = 7.0? H_3N^{\^}-C_{|↙{H}}H-CO-NH-CH-C_{|↙{R_1}}H-CO-NH-C_{|↙{R_2}}H-CO-NH-C_{|↙{H}}H-COO^{-} Peptide R_1 R_2 I H H II H CH_3 III CH_2COOH H IV CH_2CONH_2 (CH_2)_4NH_2 V CH_2CONH_2 CH_2CONH_2 VI (CH_2)_4NH_2 (CH_2)_4NH_2 VII CH_2COOH CH_2CONH_2 VIII CH_2OH (CH_2)_4NH_2 IX (CH_2)_4NH_2 CH_3 [JEE Adv 2012 P1]

Biomolecules

Section: Chemistry

Question : 14 of 20

Marks: +1, -0

The substituents R1 and R2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at pH = 7.0?

−

H−CO−NH−CH−

H−CO−NH−

H−COO−

[JEE Adv 2012 P1]

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