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R-underset(NH(2))underset("| ")("C ")...

`R-underset(NH_(2))underset("| ")("C ")H-COOH overset(HNO_(2))rarr A`. The product A is

A

`RCH_(2)COOH`

B

`RCH_(2)NH_(2)`

C

`RCH(OH)COOH`

D

`RCH(OH)CH_(2)OH`

Text Solution

Verified by Experts

The correct Answer is:
C
Amine group on reaction with `HNO_(2)` changes to `-OH` group
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{:(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 ?

{:(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

CH_(3)CH(OH)COOH underset(H_(2)O_(2)//Fe^(2+))rarr ? The product is

C_(6)H_(5)N_(2)Cl underset(KCN)overset(CuCN)rarr A underset(H^(+))overset(H_(2)O)rarr B underset(Delta)overset(NH_(3))rarr C underset(NaOH)overset(Br_(2))rarr D . Identify the final product, D.

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Consider the following reaction underset(Pd-BaSO_(4))overset(H_(2))rarr A The product A is

CH_(3)CHO overset("Chromic acid")rarr A overset(Ca(OH)_(2))rarr B underset("distillation")overset("dry")rarr C overset(NH_(2)OH)rarr D . Name the product 'D' of the above conversions.

AAKASH SERIES-PROTEINS AND NUCLEIC ACIDS -PRACTICE SHEET - 1
  1. Which of the following statements is/are wrong

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  2. Which of the following amino acids contains sulphur in its structure

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  3. R-underset(NH(2))underset("| ")("C ")H-COOH overset(HNO(2))rarr A. ...

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  4. Which statement about the zwitter ionic form of an amino acid acid is ...

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  5. You have a mixture of three amino acids : E(pI = 3.2), Y(pI = 5.7) & K...

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  6. Which of the following statements is true for phenylalanine in an aque...

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  7. Which of the following statements most correctly defines the isoelectr...

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  8. At isoelectric point, amino acid is present as

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  9. Which of the following statement is not true ?

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  10. Which of the following is the major solute species in a solution of al...

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  11. An activated amino acid A(H(2)NCHRCOX) reacts with an amino acid B(H(2...

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  12. Which statement about proteins is correct ?

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  13. Peptides are compounds of amino acids joined by amide bonds. Which of ...

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  14. Which of the following is an important secondary structural feature in...

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  15. A protein can be denaturated by ……….

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  16. Which of the following combination are correct in case of proteins ?

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  17. alpha - amino acids are high melting crystalline solids because of the...

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  18. alpha - amino acids are high melting crystalline solids because of the...

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  19. alpha - amino acids are high melting crystalline solids because of the...

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  20. The product (A) is

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