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251. Give equations of the following reactions:
Dilute HNO₃ with phenol.

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252. Give equations of the following reactions:

Treating phenol with chloroform in presence of aqueous NaOH.

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253.

Explain the following with an example:
Kolbe’s reaction.

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254.

Explain the following with an example:
Reimer-Tiemann reaction.

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255.

Explain the following with an example:
Williamson ether synthesis.

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256. Explain the following with an example:
Unsymmetrical ether.

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257.

Write mechanism of acid dehydration of ethanol to yield ethene.

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Propene is react with water in the presence of an acid as a catalyst, then propan-2-ol is obtained.

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259. How are the following conversions carried out?
Benzyl chloride → Benzyl alcohol

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260. How are the following conversions carried out?
Ethyl magnesium chloride → propane-1-ol.

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