Home
Class 11
CHEMISTRY
Assertion : E(1)cB reaction is favoured ...

Assertion : `E_(1)cB` reaction is favoured by stabilisation of carbanion and poor leaving group.
Reason : The reaction is kinetically of the second order and unimolecular.

A

If both (A) and (R ) are correct and (R ) is the correct explanation of (A)

B

If both (A) and (R ) are correct, but (R ) is not the correct explanation of (A)

C

If (A) is correct, but (R ) is incorrect

D

If both (A) and (R ) are incorrect

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ORGANIC CHEMISTRY : SOME BASIC PRINCIPLES - PART II (ISOMERISM AND REACTION MECHANISM)

    BRILLIANT PUBLICATION|Exercise LEVEL-II|40 Videos

  • ORGANIC CHEMISTRY : SOME BASIC PRINCIPLES - PART I (NOMENCLATURE)

    BRILLIANT PUBLICATION|Exercise LEVEL-III|45 Videos

  • ORGANIC CHEMISTRY : SOME BASIC PRINCIPLES - PART III (PURIFICATION AND CHARACTERISATION OF ORGANIC COMPOUNDS)

    BRILLIANT PUBLICATION|Exercise LEVEL-II (ASSERTION-REASON TYPE)|15 Videos

Similar Questions

Explore conceptually related problems

Assertion : Carboxylic acids contain a carbonyl group but do not give characteristic reaction of the carbonyl group. Reason : The electrophilicity of the carbonyl carbon is more in carbocylic acids than in aldehydes and ketones.

Assertion : S_(N)1 reaction is carried out in polar protic solvents. Reason : Polar protic solvents increases the stability of carbocation due to solvation.

Assertion : E_(a) of the forward reaction is higher than that backward reaction in a reversible endothermic reaction. Reason: Increasing the temperature of the substance increase the fraction of molecules which collide with energies greater than E_(a) .

Assertion: Friedel-Crafts alkylation and acylation of benzaldehyde do not take place . Reason : Under the above reaction conditions aldehyde group gives addition reaction. : If both assertion and reason are correct and reason is the correct explanation of assertion., Both assertion and reason are correct but reason is not the correct explanation of assertion, If assertion is correct and reason is not correct, Assertion is wrong and reason is correct

Assertion : In a zero order reaction, if concentration of the reactant is doubled, half-life period is also doubled. Reason: The total time taken for a zero order reaction to complete is double of the half-life period.

Assertion : Action of HNO_(2) on propan-1-amine gives mainly propan-2-ol. Reason : The reaction proceeds via carbocation intermediate and so rearranged products are possible.

Assertion: The presence of nitro group facilitates nucleophilic substitution reaction in aryl halide. Reason : The intermediate carbanion is stabilised due to the presence of the nitro group.

Assertion : Concentration of reactant in zero order reaction is constant. Reason : For zero order reaction A to B , successive half life of reaction decreases with the progress of the reaction.

BRILLIANT PUBLICATION-ORGANIC CHEMISTRY : SOME BASIC PRINCIPLES - PART II (ISOMERISM AND REACTION MECHANISM) -LEVEL-II (ASSERTION-REASON TYPE)
  1. Assertion : Simple carbanions are usually pyramidal but allyl carbanio...

    Text Solution

    |

  2. Assertion : All the carbon atoms of but-2-ene lie in one plane. Reas...

    Text Solution

    |

  3. Assertion : A free radical is paramagnetic species. Reason : A free ...

    Text Solution

    |

  4. Assertion : Tertiary carbocations are generally formed more easily tha...

    Text Solution

    |

  5. Assertion : tert-Butyl carbanion is more stable than methyl carbanion....

    Text Solution

    |

  6. Assertion : The order of stability of carbocations are R(3)C^(+)gtR(2)...

    Text Solution

    |

  7. Assertion : 1^(@) allylic halides are more reactive than 1^(@) RX in S...

    Text Solution

    |

  8. Assertion : Crown ether acts as phase transfer catalysis and increases...

    Text Solution

    |

  9. Assertion : RS^(Theta) is a stronger nucleophile and a better leaving ...

    Text Solution

    |

  10. Assertion : E(1)cB reaction is favoured by stabilisation of carbanion ...

    Text Solution

    |

  11. Assertion : Inductive effect is responsible for the dipole moment in t...

    Text Solution

    |

  12. Assertion : A carbanion is pyramidal in shape like NH(3) and amines. ...

    Text Solution

    |

  13. Assertion : Hybridisation influences the bond length and bond enthalpy...

    Text Solution

    |

  14. Assertion : Rotation about C = C is restricted. Reason : Electron ch...

    Text Solution

    |

  15. Assertion : Heterolytic fission involves breaking of bond in such a wa...

    Text Solution

    |

  16. Assertion : The order of reactivity of carbocations is 3^(@)gt2^(@)1^(...

    Text Solution

    |

  17. Assertion : When inductive and electromeric effects operate in opposit...

    Text Solution

    |

  18. Assertion : 1^(@) allylic halides are more reactive than 1^(@) RX in S...

    Text Solution

    |

  19. Assertion : Rate of ethanolysis of 1^(@) halide by S(N)1 mechanism is...

    Text Solution

    |

  20. Assertion : Allyl and benzyl carbonium ions are more stable than propy...

    Text Solution

    |