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Alcohols, Phenols and Ethers

Short Answer Type

281. Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. Give reason.

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282. Write the equation of the reaction of hydrogen iodide with 1-proxypropane.

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283. Write the equation of the reaction of hydrogen iodide with methoxybenzene.

O—CH₃ bond is weaker than —OC₆H₅. Therefore, O—CH₃ bond is broken easily to form phenol and iodo methane and no CH₃OH is formed. It is also due to steric factors during protonation at methoxy benzene.

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284. Write the equation of the reaction of hydrogen iodide with benzyl ethyl ether.

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Long Answer Type

285. Explain the fact that in aryl alkyl ethers (i) the alkoxy group activates the benzene ring towards electrophilic substitution and (ii) it directs the incoming substituents to ortho and para positions in benzene ring.

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