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Biomolecules question

2012 · Shift 1 · Q19
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Biomolecules question

2012 · Shift 1 · Q19

JEE AdvancedChemistryBiomoleculesNumerical+3 / −1

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 ?

IIT-JEE 2012 Paper 1 Offline Chemistry - Biomolecules Question 11 English

Peptide R1{R_1}R1​ R2{R_2}R2​
I H H
II H CH3C{H_3}CH3​
III CH2COOHC{H_2}COOHCH2​COOH H
IV CH2CONH2C{H_2}CON{H_2}CH2​CONH2​ (CH2)4NH2{(C{H_2})_4}N{H_2}(CH2​)4​NH2​
V CH2CONH2C{H_2}CON{H_2}CH2​CONH2​ CH2CONH2C{H_2}CON{H_2}CH2​CONH2​
VI (CH2)4NH2{(C{H_2})_4}N{H_2}(CH2​)4​NH2​ (CH2)4NH2{(C{H_2})_4}N{H_2}(CH2​)4​NH2​
VII CH2COOHC{H_2}COOHCH2​COOH CH2CONH2C{H_2}CON{H_2}CH2​CONH2​
VIII CH2OHC{H_2}OHCH2​OH (CH2)4NH2{(C{H_2})_4}N{H_2}(CH2​)4​NH2​
IX (CH2)4NH2{(C{H_2})_4}N{H_2}(CH2​)4​NH2​ CH3C{H_3}CH3​

Numerical answer
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