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The temporary effect in which there is c...

The temporary effect in which there is complete tranfer of a shared pair of pi-electrons to one of the atoms joined by a multiple bond on the demand of an attacking reagent is called

A

Inductive effect

B

Positive resonance effect

C

Negative resonance effect

D

Electromeric effect

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The correct Answer is:
D
By definition
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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. 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 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?

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. 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))):}

When two atoms shair one pair of electrons they are said to be joined by a

ERRORLESS-GENERAL ORGANIC CHEMISTRY -NCERT BASED QUESTIONS (Dipole Moment, Resonance and Reaction Intermediates )
  1. Which has the highest dipole moment?

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  2. Polarisation of electrons in acrolein may be written as :

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  3. The temporary effect in which there is complete tranfer of a shared pa...

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  4. All bonds in benzene are equal due to

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  5. C-C' bond length in benzene lies between single and double bond. The r...

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  6. Arrangements of (CH(3))(3)C-,(CH(3))(2)CH-,CH(3).CH(2)- when attached ...

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  7. Orbital interaction ( partial overlapping ) between the sigma bonds of...

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  8. The least stable free radical is

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  9. Among the given cation,s the most stable carbonium ions is ?

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

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  11. An aromatic among other things should have a pi-electron cloud contain...

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  12. Which is the most stable carbocation

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  13. Hyperconjugation is also known as

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  14. Relative stabilities of the following carbocations will be in the orde...

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  15. Chloroacetic acid is a stronger acid than acetic acid this can be expl...

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  16. Amongst the given structures , which are permissible resonance forms ?

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

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  18. Ionic species are stabilised by the dispersal of charge. Which of the ...

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  19. The strongest acid is :

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  20. Aromatic properties of benzene are proved by

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