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Give reason. In case of optically active...

Give reason. In case of optically active alkyl halides, SN1 reactions are accompanied by racemisation

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Due to planar nature (`Sp^(2)`hybridisation) of carboncation, the nucleophile can attack on either side resulting in the formation of both enatiomers.
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The typical reaction of alkyl halide is :

S_(N)1 reaction of alkyl halides leads to :

The alkyl halides required to prepare by Wurtz reaction are

The alkyl halides required to prepare by wurtz reaction are

The alkyl halide that undergoes S_(N)I reaction more readily is :

Comprehension The first demonstration of the stereochemistry of the S_(N^2) reaction was carried out in 1934 by Prof. E.D Hughes and his colleagues at the University of London. They allowed (R) -2- iodooctane to react with radioactive iodide ion (""^(**)I-) The rate of substitution (rate constant K_5 ) was determined by measuring the rate of incorporation of radioactivity into the alkyl halide. The rate of loss of optical acitivity from the alkyl halide (rate constant K_0 ) was also determined under the same conditions: What ratio K_0//K_s is predicted for each of the following stereochemical scenarios : For inversion reaction :

SUNSTAR PUBLICATION-II PUC CHEMISTRY ( ANNUAL EXAM QUESTION PAPER MARCH - 2020)-PART-D
  1. Give reason. In case of optically active alkyl halides, SN1 reactions ...

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  2. Calculate the packing efficiency in Face Centred Cubic (FCC) structure...

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  3. Calcium metal crystallises in a face centered cubic lattice with edge ...

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  4. Vapour pressure of benzene is 200 mm of Hg. When 2 gram of a non-volat...

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  5. What are azeotropes? Give an example for binary solutions showing mini...

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  6. Calculate the e.m.f. of the cell in which the following reaction takes...

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  7. State Kohlrausch law of independent migration of ions.

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  8. Define limiting molar conductivity?

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  9. Derive an intergrated rate for the first order reaction.

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  10. According to collision theory, what are the two factors that lead to e...

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  11. Write a note on Dialysis.

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  12. What is the effect on AH and AS during the process of adsorption?

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  13. Give an example for heterogeneous catalysis.

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  14. Write equations for the steps in S(N)1 mechanism of conversion of tert...

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  15. Complete the following reactions: CH3- CH = CH2 + HI to

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  16. Complete the following reactions:

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  17. Complete the following reactions: CH3CH2 Br underset("Aq. Ethanol")...

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  18. Write the mechanism of acid catalysed dehydration of ethanol to ethene...

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  19. How does anisole react with methyl chloride?

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  20. How is benzoyl chloride converted into benzaldehyde. Write the equatio...

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  21. Write a general equation for the formation of carboxylic acid from Gri...

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