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tert-Butylbromide reacts with aq. NaOH b...

tert-Butylbromide reacts with aq. NaOH by `S_(N)1` mechanism while n - butylbromide reacts by `S_(N)2` mechanism. Why ?

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Nucleophilic aliphatic substitution reaction is mainly of two types: S_(N)1 and S_(N)2 . The S_(N)1 mechanism is a two step process. Reaction velocity of S_(N)1 reaction depends only on the concentration of the substrate. Since product formation takes place by the formation of carbocation, optically active substrate gives (+) and (-) forms of the product. In most of the cases the product usually consists of 5-20% inverted product and 80-95% racemised species. The more stable the carbocation, the greater is the proportion of racemisation. In solvolysis reaction, the more nucleophilic the solvent, the greater is the proportion of inversion. Which one of the following compound will give S_(N)1 reaction predominantly?

Nucleophilic aliphatic substitution reaction is mainly of two types: S_(N)1 and S_(N)2 . The S_(N)1 mechanism is a two step process. Reaction velocity of S_(N)1 reaction depends only on the concentration of the substrate. Since product formation takes place by the formation of carbocation, optically active substrate gives (+) and (-) forms of the product. In most of the cases the product usually consits of 5-20% inverted product and 80-95% racemised species. The more stable the carbocation, the greater is the proportion of racemisation. In solvolysis reaction, the more nucleophilic the solvent, the greater is the proportion of inversion. For the gives reaction, Which substrate will give maximum racemisation?

KUMAR PRAKASHAN-HALOALKANES AND HALOARENES-SECTION - D NCERT EXEMPLAR SOLUTION (Short Answer Type Questions)
  1. Write down the structure and IUPAC name for neo-pentylbromide.

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  2. A hydrocarbon of molecular mass 72 g mol^(-1) gives a single monochlor...

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  3. Name of the alkene which will yield/chloro-1-methylcyclohexane by its ...

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  4. Which of the following haloakanes reacts with aqueous KOH most easily ...

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  5. Why can aryl halieds not be prepared by reaction of phenol with HCl in...

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  6. Which of the following compounds would undergo S(N)1 reaction faster a...

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  7. Allyl chloride is hydrolysed more readily than n-propyl chloride. Why ...

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  8. Why is it necessary to avoid even traces of misture during the use of ...

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  9. How do polar solvents help in the first step in S(N)1 mechanism ?

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  10. Write a test to detect the presence of double bond in a molecule.

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  11. Diphenyls are potential threat to the environment. How are these produ...

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  12. What are the IUPAC names of the insecticide DDT and benzenehexachlorid...

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  13. Elimination reactions (especially beta-elimination) are as common as t...

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  14. How will you obtain monobromobenzene from aniline ?

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  15. Aryl halides are extremely less reactive towards nucleophilic substitu...

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  16. tert-Butylbromide reacts with aq. NaOH by S(N)1 mechanism while n - bu...

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  17. Predict the major product formed when HCl is added to isobutylene. Exp...

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  18. Discuss the nature of C - X bond in the haloarenes.

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  19. How can you obtain iodoethane from ethanol when no other iodine contai...

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  20. Cyanide ion acts as an ambident nucleophile. From which end it acts as...

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