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Benzenediazonium chloride on reaction...

Benzenediazonium chloride on reaction with phenol in weakly basic medium gives :

A

diphenyl ether

B

p-hydroxy azobenzene

C

chlorobenzene

D

benzene

Text Solution

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Diazo coupling reaction of phenol involves an electrophilic substitution reaction on phenol through the diazonium electrophile. The formed dye is p-hydrozyazobenzene which is orange is colour. A similar reaction will also be observed by using anilline in place of phenol. In this case the dye formed is a yellow coloured dye.
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Benzene diazonium chloride on reaction with phenol in weakly basic medium gives

Diazonium salt formation and coupling reaction: When a reaction mixture of phenyl amine and nitrous acid is kept below 10^(@)C , a diazonium salt is formed. This reaction is called diazotization reaction. The diazonium ion, -N_(2)^(+) , is rather unstable and decomposes readily to nitrogen. However, delocalization of the diazonium from pi- bond electron over a benzene ring phenyl diazonium sufficiently for it to form at low temperature. The phenyl diazonium ion behaves as an electrophile, and will attack another arene molecule such as phenol. Electrophilic subsitiution takes at the 4 position, producing 4-hydroxy phenyl azobenzene. The reaction is known as coupling reaction. The compound formed is an energetically stable, yellow azo dye (the azo group is -N=N- ) The stability is due to extensive delocalisation of electrons via the nitrogen- nitrogen double bonds. Benzene diazonium chloride on reaction with phenol in weakly basic medium gives :

Benzenediazonium chloride on reaction with aniline in weakly basic medium gives

Benzene diazonium chloride on reaction with phenol in a basic medium gives:

Benzenediazonium chloride on reaction with water gives

What happens when benzene diazonium chloride reacts with phenol in weak alkaline medium ? (Give balanced equation)

Benzenediazonium chloride is reduced to benzene by

(D) on reaction with phenol under alkaline conditions gives :

Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives :

Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives :

VMC MODULES ENGLISH-ALCOHOLS, PHENOLS & ETHERS -Example
  1. Which of the following is soluble in water

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  2. Ethyl alcohol is heated with conc. H(2)SO(4) at 170^(@)C. The product ...

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  3. The compound that reacts fastest with Lucas reagent at room temperatu...

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  4. Diethyl ether on heating with conc. HI gives two moles of:

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  5. An industrial method for preparation of methanol is:

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  6. Phenol when treated with excess of bromine water gives a white precipi...

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  7. In CH(3)CH(2)OH, the bond that undegoes heterolytic clevage most read...

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  8. Phenol reacts with bromine in carbon disulphide at low temperature to ...

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  9. The products of combustion of an aliphatic thiol (RSH) at 298K are

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  10. The order of aciditic strength among the given phenols is :

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  11. (CH(3) )(3) CMgBr on reaction with D(2)O produces

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  12. Benzenediazonium chloride on reaction with phenol in weakly ba...

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  13. Among the following compounds, the strongest acid is :

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  14. 1-propanol and 2-propanol can be best distinguished by :

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  15. The compound will react most readily with NaOH of form methanol is :

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  17. The following compound on hydrolysis in aqueous acetone will give :

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  18. When phenyl magnesium bromide reacts with t-butanol the product would ...

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  19. The best method to prepare cyclohexene form cyclohexanol is by using:

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  20. (I) 1,2-Dihydroxy benzene (II) 1,3-Dihydroxy benzene (III) 1,4-Dih...

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