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In L-Phenyl alanine the amino group lies...

In L-Phenyl alanine the amino group lies at

A

right side to chiral centre

B

left side to chiral centre

C

para position to `-COOH` in benzene ring

D

ortho position to `-COOH` in benzene ring

Text Solution

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The correct Answer is:
B
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Amines are less reactive in substitution reactions. Their reactivity is much lesser than alcohols and alkylflourides towards substitution. Protonation of the amino group makes it a better leaving group, but not nearly as good a leaving group as a protonated alcohol. Protonated amino groups cannot be displaced by OH^(-) because it would react immediately with the acidic hydrogen which would convert it in to a poor nucleophile. The leaving group in quartenary ammonium ion has about the same leaving tendency as a protonated amino group but does not have acidic hydrogen. The reaction of a quartenary ammonium ion with hydroxide ion is known as Hoffmann elimination reaction. The leaving group is tertiary amine. Since a tertiary amine is only a moderately good leaving group, the reaction requires heat. The carbon to which the tertiary amine is attached is designated as alpha carbon. When the hydroxide ion starts to remove a beta H from a quartenary ammonium ion, the leaving group does not immediately start to leave because a tertiary amine is not a good leaving group. As a result, a partial negative charge builds up on the carbon from which the proton is removed. Which of the following statements is correct?

Amines are less reactive in substitution reactions. Their reactivity is much lesser than alcohols and alkylflourides towards substitution. Protonation of the amino group makes it a better leaving group, but not nearly as good a leaving group as a protonated alcohol. Protonated amino groups cannot be displaced by OH^(-) because it would react immediately with the acidic hydrogen which would convert it in to a poor nucleophile. The leaving group in quartenary ammonium ion has about the same leaving tendency as a protonated amino group but does not have acidic hydrogen. The reaction of a quartenary ammonium ion with hydroxide ion is known as Hoffmann elimination reaction. The leaving group is tertiary amine. Since a tertiary amine is only a moderately good leaving group, the reaction requires heat. The carbon to which the tertiary amine is attached is designated as alpha carbon. When the hydroxide ion starts to remove a beta H from a quartenary ammonium ion, the leaving group does not immediately start to leave because a tertiary amine is not a good leaving group. As a result, a partial negative charge builds up on the carbon from which the proton is removed. Which of the following statements are true regarding Hoffmann elimination ?

Amines are less reactive in substitution reactions. Their reactivity is much lesser than alcohols and alkylflourides towards substitution. Protonation of the amino group makes it a better leaving group, but not nearly as good a leaving group as a protonated alcohol. Protonated amino groups cannot be displaced by OH^(-) because it would react immediately with the acidic hydrogen which would convert it in to a poor nucleophile. The leaving group in quartenary ammonium ion has about the same leaving tendency as a protonated amino group but does not have acidic hydrogen. The reaction of a quartenary ammonium ion with hydroxide ion is known as Hoffmann elimination reaction. The leaving group is tertiary amine. Since a tertiary amine is only a moderately good leaving group, the reaction requires heat. The carbon to which the tertiary amine is attached is designated as alpha carbon. When the hydroxide ion starts to remove a beta H from a quartenary ammonium ion, the leaving group does not immediately start to leave because a tertiary amine is not a good leaving group. As a result, a partial negative charge builds up on the carbon from which the proton is removed. The compounds 'C' in question number 31 on heating with moist silver oxide gives

AAKASH SERIES-BIOMOLECULES-PRACTICE EXERCISE
  1. Which of the following amino acids does not correspond to the general ...

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  2. Among Valine, Leucine, Isoleucine, Lysine and phenyl alanine, odd memb...

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  3. In L-Phenyl alanine the amino group lies at

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  4. The pH at which an amino acid carries no net charge is called it's

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  5. For a neutral amino acid (X), isoelectric point is 5.8. Now its solubi...

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  6. Which of the following molecule is capable of forming zwitter ion ?

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  7. RNA differs from DNA with respect to the following

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  8. The number of tripeptides formed by three different amino acids having...

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  9. Proteins contain the following chemical linkages in addition to -CO-NH...

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  10. In a protein ,the different type of attractions that exist are (A)...

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  11. Denaturation of protein leads to loss of its biological activity by

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  12. Number of C = O groups in thymine and in X are equal. Now, X is

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  13. The sugar unit present in the nucleotides of RNA is

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  14. In nucleosides, math N-atom of pyrimidine base is joined to n" C-atom ...

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  15. Sterol, the basic unit of vitamin D, consists of 4 rings they are

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  16. Match items List - I with those in List - II from the combinations sho...

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  17. Vitamin B(1) deficiency causes

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  18. Vitamin A deficiency causes

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  19. The condition of vitamin deficiency is known as

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  20. Which one of the following is Retinol ?

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