Home
Class 12
CHEMISTRY
A partially racemised (+) - 2-bromo-octa...

A partially racemised `(+) -` 2-bromo-octane `(2^@ RX)` on reaction with aq. `NaOH` in acetone gives an alcohol with `80 %` inversion and `20 %` racemisation. What is the percentage of back-side attack ?

A

`10%`

B

`40%`

C

`80%`

D

`90%`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • QUALITATIVE ANALYSIS PART 1

    RESONANCE|Exercise A.L.P|39 Videos

  • SOLID STATE

    RESONANCE|Exercise PHYSICAL CHEMITRY (SOLID STATE)|45 Videos

Similar Questions

Explore conceptually related problems

Optically pure (+)-2 -chlorooctane, [alpha] = +40^@ , reacts with aq. NaOH in acetone to give optically pure (-)-2 -octanol, [alpha] = -12.0^@ . With partically racemised chloro compound whose [alpha] = + 30^@ , the [alpha] of alcohal product is - 6.0^@ . Calculate : (a) The percentage optical purity of partially racemised chloro compound and alcohol. (b) The percentage of inversion and racemisation. (c) The percentage of front-side and back-side attacks. (d) What interference can be drawn from the data in part (a) of the above example, about the mode of 2^@ alky1 halide. ( e) Give the rate expression. In terms if the expression, decrease the experimental changes for encourage (i) SN^1 , (ii) SN^2 ,

a. The specific rotation of a pure enantiomer is +10^(@) . What will be its observed rotation if its is isolated from a reaction with i. 30% racemisation and 70% retention. ii. 70% racemisation and 30% inversion. b. What is the percentage composition of a mixtrue of two enantiomers whose rotation is -10^(@) ? The specific rotation of pure enantiomers is -20^(@) . c. What is the optical purity of a sample having an [alpha]_(obs.)=+9.0^(@) if [alpha]_(D)=+12^(@) .

A reaction is 50% complete in 2 hours and 75% complete in 4 hours. What is the order of reaction?

Calculate the percentage of SN^(-1) product, if (R )-2 -Chloro butane on reaction with NaOH//H_(2)O and acetone gives 98% inverted product.

Statement-I: Optically active 2-idoibutane on treatment with NaI in acetone undergoes racemisation. Because Statement-II: Repeated Walden inversions on the reactant and its product evantually gives a racemic mixure.

Two numbers are respectively 20% and 50% more than a 3rd number.What is the percentage of 2nd with respect to 1st?

RESONANCE-RANK BOOSTER-All Questions
  1. overset("Reaction")to Rearranged most stable Carbocation is

    Text Solution

    |

  2. overset("NaOH")to Identify product of the reaction

    Text Solution

    |

  3. A partially racemised (+) - 2-bromo-octane (2^@ RX) on reaction with a...

    Text Solution

    |

  4. CH3-undersetunderset(CH3)(|)CH-undersetunderset(CH3)(|)oversetoverset(...

    Text Solution

    |

  5. The end product of following reaction is underset((1))overset(CH3...

    Text Solution

    |

  6. Which of the following reduction methods is not suitable for preparing...

    Text Solution

    |

  7. Compound 'X' give following reactions Its structure can be :

    Text Solution

    |

  8. CH3-undersetunderset(D)(|)CH-undersetunderset(CH3)(|)CH-CH3+Br^@ to'X'...

    Text Solution

    |

  9. The product is

    Text Solution

    |

  10. Which of the following is/are correct for the given reaction ? un...

    Text Solution

    |

  11. Statement-1:Branched alkanes have lower boiling point than their unbra...

    Text Solution

    |

  12. An isomer of C(5)H(12) gives total six isomeric products on monochlori...

    Text Solution

    |

  13. How many molar equivalent of R-MgX is required for reaction with formi...

    Text Solution

    |

  14. The number of moles of CH4 gas formed in this reaction is.

    Text Solution

    |

  15. Complete the following reaction

    Text Solution

    |

  16. The major product of the following reaction would be

    Text Solution

    |

  17. The major product of the following product of the following reaction i...

    Text Solution

    |

  18. Which of the following compounds would liberate two moles of methane w...

    Text Solution

    |

  19. Fastest rate of electrophilic addition will take place in

    Text Solution

    |

  20. Which of the following will be the correct product (P) for the given r...

    Text Solution

    |