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In pyridine electrophile preferably att...

In pyridine electrophile preferably attack at positions

A

1 and 5

B

2 and 4

C

1 and 4

D

1 and 3

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In pyridine electrophille preferably attacks at positions

The general electrophilic substitution reaction (replacement of H. by an electrophilic which is an electron deficient species) in aromatic ring is represented as followed. An electrophilic attacks on ortho and para positions which respect to a stronger +m group are present in benzene ring and the electrophilie attacks at meta position with respect to stronger -m group if two -m groups are present in benzene ring. What will be the product when electrophile Br^(o+) attacks on

The general electrophilic substitution reaction (replacement of H. by an electrophilic which is an electron deficient species) in aromatic ring is represented as followed. An electrophilic attacks on ortho and para positions which respect to a stronger +m group are present in benzene ring and the electrophilie attacks at meta position with respect to stronger -m group if two -m groups are present in benzene ring. The product of the following reaction is

HIV attacks

Electrophiles are Lewis acids.

What is Electrophiles?

The electrophile in first step is

The electrophile in first step is

Symmetrically subsituted epoxides give the same products in both the acid catalysed and base catalyzed ring opening. An unsymmetrical epoxide gives different products under acid catalysed and base catalysed conditions. Under basic contions, the alkoxide ion simply attacks the less hindered carbon atom in an SN^(2) displacement. Under acidic conditions, the alcohol, attacks the protonated epoxide. Structure II and III show that the oxtrane carbon share part of positive charge. The tertiary carbon bear a larger part of positive charge and it is more strongly electrophilic. The bond between teritiary carbon and oxygen is weaker implying a lower transition state energy for attack at the teritary carbon. Attack by the weak nucleophilic is sensitive to the strength of electrophilic is sensitive to the strength of electrophile. Center attack takes place at more electrophilic carbon which is usually the more substituted carbon because it can better support the positive charge. What will be the products in following reactions

Symmetrically subsituted epoxides give the same products in both the acid catalysed and base catalyzed ring opening. An unsymmetrical epoxide gives different products under acid catalysed and base catalysed conditions. Under basic contions, the alkoxide ion simply attacks the less hindered carbon atom in an SN^(2) displacement. Under acidic conditions, the alcohol, attacks the protonated epoxide. Structure II and III show that the oxtrane carbon share part of positive charge. The tertiary carbon bear a larger part of positive charge and it is more strongly electrophilic. The bond between teritiary carbon and oxygen is weaker implying a lower transition state energy for attack at the teritary carbon. Attack by the weak nucleophilic is sensitive to the strength of electrophilic is sensitive to the strength of electrophile. Center attack takes place at more electrophilic carbon which is usually the more substituted carbon because it can better support the positive charge.

AAKASH INSTITUTE ENGLISH-TEST 6-EXAMPLE
  1. Deficiency of fluoride ion in drinking water causes

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  2. In which of the following molecules all the atoms lie in one plane ? .

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  3. In pyridine electrophile preferably attack at positions

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  4. Which of the following alkenes does not undergo rearrangement on heati...

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  5. What is hydrogenation? What is its industrial application?

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  6. State True or False : sulphurous acid acts as a reducing agent

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  7. Which of the planning is incorrect about free radicals?

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  8. In nitration of benzene attacking electrophile is

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  9. B = Cyclooctatetraene C = Cyclobutadiene Which of the following is ...

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  10. Number of conformations of cyclohexane is

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  11. Which of the following can show geometrical isomerism?

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  12. Which of the following set of groups can show +R effect?

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  13. In Kolbey's electrolytic method,the gas produced at cathode is

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  14. The number of moles of Ammonium chloride in 535 g is

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  15. The number of moles of Potassium cyanide in 455 g is

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  16. Product B is

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  17. Which of the following alkane has highest DeltaH(comb.) ?

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  18. Which of the following alkyne can react with Tollen's reagent?

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  19. In conformational isomerism which property is mainly different among v...

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  20. The number of moles of Formic acid(CH2O2) in 276 g is

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