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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

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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-PROTEINS AND NUCLEIC ACIDS -PRACTICE SHEET - 4
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  2. Anti bodies are ………..

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  3. Proteins overset(" x ")underset(H(2)O)rarr Aminoacids 'x' is an enz...

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  4. Composition of DNA is …………

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  5. Insulin is an example of

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  6. In DNA strand at 136^(th) position is the base thymine, then the base ...

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  7. Which of the following has an aromatic ring ?

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  8. At p^(H)=4 Glycine exist as

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  9. Which of the following element is present in insulin ?

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  10. Iodine value is related to in our system is

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  11. Acrolin test is negative for

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  12. The waxes are long chain compounds of fatty acids and they does not be...

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  13. Which of the following/s is/are not deficiency disease of vitamine - E

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  14. Kwashiorkar is caused by the deficiency of

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  15. The number of Amino acids in the two protomers of insulin are

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  16. Walls of blood vessels, ligaments are called …………

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  17. Which of the following is true statement

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  18. Proteins can also be classified based on their shapes and solubility i...

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  19. Proteins can also be classified based on their shapes and solubility i...

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  20. Proteins can also be classified based on their shapes and solubility i...

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  21. The deficiency of enzyme in living system can cause many diseases. For...

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