Write the resonance structures of phenol (which is similar to t

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 Multiple Choice QuestionsShort Answer Type

291.

Use simple chemical test to differentiate between the following pairs of organic compounds:
(i) 2, 4, 6-trinitro phenol and 2, 4, 6-tri methyl phenol.

(ii) Anisole and benzyl alcohol.

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292. Show with the help of chemical equations what happens when ethanol is treated with phosphorus tribromide.
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293. Show with the help of chemical equations what happens when cumene hydroperoxide is treated with dilute H2SO4.
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294.

Give a chemical test to distinguish between: 2-pentanol and 3-pentanol.

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295.

Write the resonance structures of phenol (which is similar to that of chlorobenzene) and explain why it does not form chlorobenzene on reaction with PCI5 Explain whether phenol can be dehydrated on heating with catalytic amounts of conc. H2SO4.


Resonance structures of phenol:



Due to resonance, carbon-oxygen bond develops a slight double bond character. Therefore, it is not easy to replace —OH in phenols by Cl.
No, phenols cannot be dehydrated on heating with small amount of conc. H2SO4. Instead, phenols with conc. H2SO4 undergoes sulphonation.

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296.

Account for the following:
Alcohols with three or less carbons are water-soluble while alcohols with five or more carbons are insoluble.

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297.

Account for the following:
tert-butanol is more volatile than n-butanol.

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298.

To cleave the C—O bond in alcohols small amount of acid is added. Explain.

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299.

Write the reaction for the preparation of the following:

n-propyl chloride from n-propyl alcohol.

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300.

Write the reaction for the preparation of the following:
2, 4-dinitro phenol from 2, 4-dinitro chlorobenzene;

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