Phenol reacts with which one of the following reagents gives a conjugate diketone will be formed ?

Phenol reacts with which one of the following reagents gives a conjugate diketone will be formed ?
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Phenol reacts with which one of the following reagents gives a conjugate diketone will be formed ? A. `Na_(2)Cr_(2 ... `Na_(2)Cr_(2)O_(7)+H_(2)SO_(4)`
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Phenol when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid gives:

Description : Phenol when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid gives:

Last Answer : Phenol when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid gives ... C. nitrobenzene D. 2,4,6-rinitrobenzene

When phenol reacts with chloroform and an alkali, the compound formed is salicylaldehyde. If pyrene is used in place of chloroform, the product obtain

Description : When phenol reacts with chloroform and an alkali, the compound formed is salicylaldehyde. If pyrene is used in place of chloroform, the product obtain

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Explain why Grignard reagents do not reacts with alkanes.

Description : Explain why Grignard reagents do not reacts with alkanes.

Last Answer : Ans. In alkanes , the C – H bond has very little polarity . The hydrogen cannot be abstracted by the Grignard reagent.

Claisen condensation gives__________ a) Hydroxyl compound b) β- keto ester c) Γ- diketone d) Α-diketone

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----rearrangement involves alpha diketone. a. Wolf b. Schmidt c. Hofmann d. Curtius

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Bending moment at any section in a conjugate beam gives in the actual beam (A) Slope (B) Curvature (C) Deflection (D) Bending moment

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The leaks in a refrigeration system using Freon are detected by (a) halide torch which on detection produces greenish flame lighting (b) sulphur sticks which on detection gives white smoke (c) using reagents (d) sensing reduction in pressure.

Description : The leaks in a refrigeration system using Freon are detected by (a) halide torch which on detection produces greenish flame lighting (b) sulphur sticks which on detection gives white smoke (c) using reagents (d) sensing reduction in pressure.

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Ketones react with Grignard reagents to form an addition product which on hydrolysis gives a (a) Primary alcohol (b) Tertiary alcohol (c) Secondary alcohol (d) Ketal

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Ammonia leakage in the refrigeration system is detected by (A) Sulphur stick, which on detection gives white smoke (B) Using chemical reagents (C) Its smell (D) Soap solution

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Phenol reacts with methyl chloroformate in the presence of `NaOH` to form product A. A reacts with `Br_(2)` to form product B. A and B are respectivel

Description : Phenol reacts with methyl chloroformate in the presence of `NaOH` to form product A. A reacts with `Br_(2)` to form product B. A and B are respectivel

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`Br_(2)` dissolved in `CS_(2)` reacts with phenol at 273 K to give ..... as the major product

Description : `Br_(2)` dissolved in `CS_(2)` reacts with phenol at 273 K to give ..... as the major product

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Phenol reacts with bromine in carbon disulphide at low temperature to give

Description : Phenol reacts with bromine in carbon disulphide at low temperature to give

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Phenylmagnesium bromide reacts with CO2 followed by acid-hydrolysis to form : (a) Phenol (b) Benzoic acid (c) Bromobenzene (d) Acetophenone

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Phenol reacts with excess bromine water to give (a) o- plus p-Bromophenol (b) Bromobenzene (c) 2,4,6-Tribromophenol (d) m-Bromophenol

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Benzenediazonium chloride reacts with phenol to form : (a) p-chlorophenol (b) Chlorobenzene (c) p-Hydroxyazobenzene (d) DDT

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Benzenediazonium chloride reacts with hypophosphorus acid to form : (a) Phenol (b) Benzaldehyde (c) Aniline (d) Benzene

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Benzenediazonium chloride reacts with warm water to give (a) Aniline (b) Phenol (c) Benzene (d) Chlorobenzene

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Which of the following compounds reacts least rapidly in electrophilic substitution reactions? (a) Nitrobenzene (b) Phenol (c) Bromobenzene (d) Toluene

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Pick up the correct statement from the following: (A) The phenol is carbolic acid (B) The phenol is either extracted from coal-tar or prepared from benzene (C) Phenol reacts with formaldehyde, to form phenol formaldehyde resin (D) All the above

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

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

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

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Phenol on distilling with zinc dust gives

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Phenol on treatment with conc. `HNO_(3)` gives

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When phenol is treated with excess of bromine water, it gives

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Phenol on heating with NaOH followed by reaction with alky1 halide gives

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