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{:(HOOC-CH(2)-underset(NH(2))underset("|...

`{:(HOOC-CH_(2)-underset(NH_(2))underset("| ")("C ")H-COOH,underset((-COOH))(pK_(a_(1))),underset((-NH_(2)))(pK_(a_(2))),underset(("Acid or base of "-R))(pK_(a_(3)))),(" Aspartic acid"," 2.1"," 9.8"," 3.9"),(HOOC-underset(NH_(2))underset("| ")("C ")H-(CH_(2))_(4)-NH_(2),underset((-COOH))(pK_(a_(1))),underset((-NH_(2)))(pK_(a_(2))),underset(("Acid or base of "-R))(pK_(a_(3)))),(" Lysine"," 2.2"," 9.0"," 10.5"),(HOOC-underset(NH_(2))underset("| ")("C ")H-CH-OH,,,),(" Threonine"," 2.6"," 10.4",),(HOOC-underset(NH_(2))underset("| ")("C ")H-CH_(2)CH_(2)CONH_(2),,,),(" Glutamine"," 2.2"," 9.1",):}`
The aqueous solution of lysine is neutral at

A

pH = 7

B

pH = 9.8

C

`2.2`

D

`5.6`

Text Solution

Verified by Experts

The correct Answer is:
B
Neutral Form Exist under more basic condition
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underset([S])([M(NH_(3))_(6)]^(2+)) to underset([S])(M(NH_(2))_(2))+xunderset((g))(NH_(3))+yunderset((g))(H_(2))

Write the IUPAC name of CH_(3)-CH_(2)-underset(CH_(2)OH)underset(|)(CH)-CH_(2)-underset(CH_(2)CH_(3))underset(|)(CH)-CH_(3)

Knowledge Check

  • {:(HOOC-CH_(2)-underset(NH_(2))underset("| ")("C ")H-COOH,underset((-COOH))(pK_(a_(1))),underset((-NH_(2)))(pK_(a_(2))),underset(("Acid or base of "-R))(pK_(a_(3)))),(" Aspartic acid"," 2.1"," 9.8"," 3.9"),(HOOC-underset(NH_(2))underset("| ")("C ")H-(CH_(2))_(4)-NH_(2),underset((-COOH))(pK_(a_(1))),underset((-NH_(2)))(pK_(a_(2))),underset(("Acid or base of "-R))(pK_(a_(3)))),(" Lysine"," 2.2"," 9.0"," 10.5"),(HOOC-underset(NH_(2))underset("| ")("C ")H-CH-OH,,,),(" Threonine"," 2.6"," 10.4",),(HOOC-underset(NH_(2))underset("| ")("C ")H-CH_(2)CH_(2)CONH_(2),,,),(" Glutamine"," 2.2"," 9.1",):} At pH = 3 which of the following of aspartic acid is predominant ?

    A
    `""^(-)OOC-CH_(2)-underset(NH_(3)^(+))underset("| ")("C ")H-COO^(-)`
    B
    `""^(-)OOC-CH_(2)-underset(NH_(3)^(+))underset("| ")("C ")H-COO^(-)`
    C
    `HOOC-CH_(2)-underset(NH_(3)^(+))underset("| ")("C ")H-COO^(-)`
    D
    `HOOC-CH_(2)-underset(NH_(2))underset("| ")("C ")H-COO^(-)`

  • {:(HOOC-CH_(2)-underset(NH_(2))underset("| ")("C ")H-COOH,underset((-COOH))(pK_(a_(1))),underset((-NH_(2)))(pK_(a_(2))),underset(("Acid or base of "-R))(pK_(a_(3)))),(" Aspartic acid"," 2.1"," 9.8"," 3.9"),(HOOC-underset(NH_(2))underset("| ")("C ")H-(CH_(2))_(4)-NH_(2),underset((-COOH))(pK_(a_(1))),underset((-NH_(2)))(pK_(a_(2))),underset(("Acid or base of "-R))(pK_(a_(3)))),(" Lysine"," 2.2"," 9.0"," 10.5"),(HOOC-underset(NH_(2))underset("| ")("C ")H-CH-OH,,,),(" Threonine"," 2.6"," 10.4",),(HOOC-underset(NH_(2))underset("| ")("C ")H-CH_(2)CH_(2)CONH_(2),,,),(" Glutamine"," 2.2"," 9.1",):} The Zwitter ionic form of lysine is

    A
    `""^(-)OOC-Cunderset(NH_(2))underset("| ")("H ")-(CH_(2))_(4)-overset(+)(N)H_(3)`
    B
    `""^(-)OOC-C underset(+NH_(3))underset(" |")(" H")-(CH_(2))_(4)-NH_(2)`
    C
    `HOOC-C underset(+NH_(3))underset(" |")(" H")-(CH_(2))_(4)-overset(+)(N)H_(3)`
    D
    `""^(-)OOC-C underset(+NH_(3))underset(" |")(" H")-(CH_(2))_(4)-overset(+)(N)H_(3)`

  • {:(HOOC-CH_(2)-underset(NH_(2))underset("| ")("C ")H-COOH,underset((-COOH))(pK_(a_(1))),underset((-NH_(2)))(pK_(a_(2))),underset(("Acid or base of "-R))(pK_(a_(3)))),(" Aspartic acid"," 2.1"," 9.8"," 3.9"),(HOOC-underset(NH_(2))underset("| ")("C ")H-(CH_(2))_(4)-NH_(2),underset((-COOH))(pK_(a_(1))),underset((-NH_(2)))(pK_(a_(2))),underset(("Acid or base of "-R))(pK_(a_(3)))),(" Lysine"," 2.2"," 9.0"," 10.5"),(HOOC-underset(NH_(2))underset("| ")("C ")H-CH-OH,,,),(" Threonine"," 2.6"," 10.4",),(HOOC-underset(NH_(2))underset("| ")("C ")H-CH_(2)CH_(2)CONH_(2),,,),(" Glutamine"," 2.2"," 9.1",):} Consider the following structures for glutamine : (I) HOOC-underset(NH_(2))underset("| ")("C ")H-CH_(2)CONH_(2) (II) ""^(-)OOC-underset(NH_(2))underset("| ")("C ")H-CH_(2)CONH_(2) (III) ""^(-)OOC-underset(+NH_(3))underset("|")("C")H-CH_(2)CONH_(2)

    A
    I and II are conjugate acid - base pairs
    B
    The maximum conc. of II is found at pH = 9.1
    C
    The maximum con. of III is found at pH = 2.2
    D
    I and II are conjugate acid and conjugate base of III, respectively

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