Home
Class 12
CHEMISTRY
Electromeric effect:...

Electromeric effect:

A

comes into play at the demand of attacking reagent

B

involves displacement of electrons in a sigma bond

C

comes into play in the molecule when atleast one atom has unshared pair of electrons

D

involves the distortion of the electron cloud

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • BASIC PRINCIPLES OF ORGANIC COMPOUNDS (MECHANISM OF ORGANIC REACTIONS)

    OP TANDON|Exercise OBJECTIVE QUESTIONS (Level-B)|25 Videos

  • BASIC PRINCIPLES OF ORGANIC COMPOUNDS (MECHANISM OF ORGANIC REACTIONS)

    OP TANDON|Exercise SET II|24 Videos

  • BASIC PRINCIPLES OF ORGANIC COMPOUNDS (MECHANISM OF ORGANIC REACTIONS)

    OP TANDON|Exercise BRAIN STORMING PROBLEMS|14 Videos

  • BASIC PRINCIPLES

    OP TANDON|Exercise SECTION V INTEGER ANSWER TYPE QUESTION|3 Videos

  • CARBOXYLIC ACIDS AND THEIR DERIVATIVES

    OP TANDON|Exercise Integer|4 Videos

Similar Questions

Explore conceptually related problems

Explain the terms Inductive and Electromeric effects. Which electron displacement effect explains the following correct orders of acidity of the carboxylic acids? (a) Cl_(3)"CC"OOH gt Cl_(2)CHCOOH gt ClCH_(2)COOH (b) CH_(3)CH_(2)COOHgt(CH_(3))_(2)CHCOOHgt(CH_(3))_(3)C.COOH

The electronic displacements in covalent bonds may occur either in the ground state under the influence of an atom or a substituent group or in presence of an appropriate attacking reagent. As a result of these electron displacements, centres of different electron densities are created and these centres are susceptible to attack by the reagents. These electron displacements occur through inductive electromeric, resonance and hyperconjugation effects. Whereas inductive effect involves displacement of sigam -electrons towards the substituent, resonance effect involves delocalization of pi- electrons transmitted through the chain and both are permanent effect. Electromeric effect is the complete transfer of a shared pair of pi - electrons to one of the atoms joined by a multiple bond on the demand of an attacking reagent. Hyperconjugation effects on the other hand involve delocalization of sigma -electrons of C-H bond of an alkyl group directly attached to an atom of unsaturated system (i.e., sigma-pi -conjugation). Both inductive and hyperconjugation effects can be used to explain the stability of carbocations and free radicals which follow the stability order : 3^(@)gt2^(@)gt1^(@) . The stability or carbanions, however, follows the reverse order. An organic reaction occurs through making and breaking of bonds. The breaking of a covalent bond may occur either homolytic leading to the formation of free radicals or heterolytic forming positively (carbocations) or negatively (carbanions) charged species. Most of the attacking reagents carry either a positive or a negative charge. The positively charged species with electron deficient centre or neutral species (free radicals, carbenes, nitrene) are collectively called electrophiles, while negatively charged species with electron rich centre or neutral species (like water, alcohol, ammonia, etc.) are called nucleophiles. Which of the following groups has highest inductive effect?

The electronic displacements in covalent bonds may occur either in the ground state under the influence of an atom or a substituent group or in presence of an appropriate attacking reagent. As a result of these electron displacements, centres of different electron densities are created and these centres are susceptible to attack by the reagents. These electron displacements occur through inductive electromeric, resonance and hyperconjugation effects. Whereas inductive effect involves displacement of sigam -electrons towards the substituent, resonance effect involves delocalization of pi- electrons transmitted through the chain and both are permanent effect. Electromeric effect is the complete transfer of a shared pair of pi - electrons to one of the atoms joined by a multiple bond on the demand of an attacking reagent. Hyperconjugation effects on the other hand involve delocalization of sigma -electrons of C-H bond of an alkyl group directly attached to an atom of unsaturated system (i.e., sigma-pi -conjugation). Both inductive and hyperconjugation effects can be used to explain the stability of carbocations and free radicals which follow the stability order : 3^(@)gt2^(@)gt1^(@) . The stability or carbanions, however, follows the reverse order. An organic reaction occurs through making and breaking of bonds. The breaking of a covalent bond may occur either homolytic leading to the formation of free radicals or heterolytic forming positively (carbocations) or negatively (carbanions) charged species. Most of the attacking reagents carry either a positive or a negative charge. The positively charged species with electron deficient centre or neutral species (free radicals, carbenes, nitrene) are collectively called electrophiles, while negatively charged species with electron rich centre or neutral species (like water, alcohol, ammonia, etc.) are called nucleophiles. The decreasing order of basic strength in underset("(I)")(C_(6)H_(5)NH_(2))," "underset("(II)")((C_(6)H_(5))_(2)NH)," "underset("(III)")(CH_(3)NH_(2))," "underset("(IV)")(NH_(3)) is:

The electronic displacements in covalent bonds may occur either in the ground state under the influence of an atom or a substituent group or in presence of an appropriate attacking reagent. As a result of these electron displacements, centres of different electron densities are created and these centres are susceptible to attack by the reagents. These electron displacements occur through inductive electromeric, resonance and hyperconjugation effects. Whereas inductive effect involves displacement of sigam -electrons towards the substituent, resonance effect involves delocalization of pi- electrons transmitted through the chain and both are permanent effect. Electromeric effect is the complete transfer of a shared pair of pi - electrons to one of the atoms joined by a multiple bond on the demand of an attacking reagent. Hyperconjugation effects on the other hand involve delocalization of sigma -electrons of C-H bond of an alkyl group directly attached to an atom of unsaturated system (i.e., sigma-pi -conjugation). Both inductive and hyperconjugation effects can be used to explain the stability of carbocations and free radicals which follow the stability order : 3^(@)gt2^(@)gt1^(@) . The stability or carbanions, however, follows the reverse order. An organic reaction occurs through making and breaking of bonds. The breaking of a covalent bond may occur either homolytic leading to the formation of free radicals or heterolytic forming positively (carbocations) or negatively (carbanions) charged species. Most of the attacking reagents carry either a positive or a negative charge. The positively charged species with electron deficient centre or neutral species (free radicals, carbenes, nitrene) are collectively called electrophiles, while negatively charged species with electron rich centre or neutral species (like water, alcohol, ammonia, etc.) are called nucleophiles. Out of the following series, the one containing only electrophiles is:

The electronic displacements in covalent bonds may occur either in the ground state under the influence of an atom or a substituent group or in presence of an appropriate attacking reagent. As a result of these electron displacements, centres of different electron densities are created and these centres are susceptible to attack by the reagents. These electron displacements occur through inductive electromeric, resonance and hyperconjugation effects. Whereas inductive effect involves displacement of sigam -electrons towards the substituent, resonance effect involves delocalization of pi- electrons transmitted through the chain and both are permanent effect. Electromeric effect is the complete transfer of a shared pair of pi - electrons to one of the atoms joined by a multiple bond on the demand of an attacking reagent. Hyperconjugation effects on the other hand involve delocalization of sigma -electrons of C-H bond of an alkyl group directly attached to an atom of unsaturated system (i.e., sigma-pi -conjugation). Both inductive and hyperconjugation effects can be used to explain the stability of carbocations and free radicals which follow the stability order : 3^(@)gt2^(@)gt1^(@) . The stability or carbanions, however, follows the reverse order. An organic reaction occurs through making and breaking of bonds. The breaking of a covalent bond may occur either homolytic leading to the formation of free radicals or heterolytic forming positively (carbocations) or negatively (carbanions) charged species. Most of the attacking reagents carry either a positive or a negative charge. The positively charged species with electron deficient centre or neutral species (free radicals, carbenes, nitrene) are collectively called electrophiles, while negatively charged species with electron rich centre or neutral species (like water, alcohol, ammonia, etc.) are called nucleophiles. Consider the following alkenes and what is correct decreasing order of stability? {:(underset("(I)")underset("But-1-ene")(CH_(3)CH_(2)CH=CH_(2))", "underset("(II)")underset("2,3-Dimethylbut-2-ene")((CH_(3))_(2)C=(CH_(3))_(2))","),(underset("(III)")underset("2-Methylbut-2-ene")((CH_(3))_(2)C=CHCH_(3))", "underset("(IV)")underset("2-Methylpropene")((CH_(3))_(2)C=CH_(3))):}

The electronic displacements in covalent bonds may occur either in the ground state under the influence of an atom or a substituent group or in presence of an appropriate attacking reagent. As a result of these electron displacements, centres of different electron densities are created and these centres are susceptible to attack by the reagents. These electron displacements occur through inductive electromeric, resonance and hyperconjugation effects. Whereas inductive effect involves displacement of sigma -electrons towards the substituent, resonance effect involves delocalization of pi- electrons transmitted through the chain and both are permanent effect. Electromeric effect is the complete transfer of a shared pair of pi - electrons to one of the atoms joined by a multiple bond on the demand of an attacking reagent. Hyperconjugation effects on the other hand involve delocalization of sigma -electrons of C-H bond of an alkyl group directly attached to an atom of unsaturated system (i.e., sigma-pi -conjugation). Both inductive and hyperconjugation effects can be used to explain the stability of carbocations and free radicals which follow the stability order : 3^(@)gt2^(@)gt1^(@) . The stability or carbanions, however, follows the reverse order. An organic reaction occurs through making and breaking of bonds. The breaking of a covalent bond may occur either homolytic leading to the formation of free radicals or heterolytic forming positively (carbocations) or negatively (carbanions) charged species. Most of the attacking reagents carry either a positive or a negative charge. The positively charged species with electron deficient centre or neutral species (free radicals, carbenes, nitrene) are collectively called electrophiles, while negatively charged species with electron rich centre or neutral species (like water, alcohol, ammonia, etc.) are called nucleophiles. Which of the following is most stable cation?

Which of the following is a permanent electron displacement effect? Inductometric Electromeric Inductive All of the mentioned

OP TANDON-BASIC PRINCIPLES OF ORGANIC COMPOUNDS (MECHANISM OF ORGANIC REACTIONS)-OBJECTIVE QUESTIONS (Level-A)
  1. Maximum -I effect is exerted by the group-

    Text Solution

    |

  2. Zero inductive effect is exerted by:

    Text Solution

    |

  3. Electromeric effect:

    Text Solution

    |

  4. The reaction intermediate produce by homolytic cleavage of bond is cal...

    Text Solution

    |

  5. The stablest free radical among the following is :

    Text Solution

    |

  6. In CH(3)CH(2)OH, the bond that undergoes heterolytic cleavage most rea...

    Text Solution

    |

  7. The most stable carbocation is :

    Text Solution

    |

  8. The most stable carbanion is :

    Text Solution

    |

  9. Which of the following ions is most stable?

    Text Solution

    |

  10. In which of the following, homolytic bond fission takes place :

    Text Solution

    |

  11. The temporary effect in which there is a complete transfer of shared p...

    Text Solution

    |

  12. The number of electrons present in the valence shell of carbon of CH(3...

    Text Solution

    |

  13. The number of electrons, present in the valence shell of carbon of car...

    Text Solution

    |

  14. In which of the following compounds the carbon marked with asterisk is...

    Text Solution

    |

  15. Electronegativity of carbon atoms depends upon their state of hybridis...

    Text Solution

    |

  16. The strongest acid amongst the following compound is

    Text Solution

    |

  17. The shape of CH(3)^(+) is ………….

    Text Solution

    |

  18. In which of the following compounds, the C-Cl bond ion-isation shall g...

    Text Solution

    |

  19. Most stable carbocation is:

    Text Solution

    |

  20. Most stable carbocation is:

    Text Solution

    |