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How many of the following of ethrs canno...

How many of the following of ethrs cannot be prepared by Williamson's synthesis
`CH_(3)OC_(2)H_(5),(C_(6)H_(5))_(2)O,C_(6)H_(5)OCH_(3),C_(6)H_(5)OC_(2)H_(5)`
`(CH_(3))_(3)COC(CH_(3))_(3), (C_(2)H_(5))_(2)O,C_(6)H_(5)CH_(2)OC_(6)H_(5)`,
`(CH)_(3))_(3)COCH_(3),(CH_(3))_(3)COCH_(2)CH_(3)`.

Text Solution

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The correct Answer is:
2
Williamson.s syntesis nequires that the alkyl halide should be primary and alkoxide may be primary secondary or tertiary. Hence, two ethers which cannot be prepared by williamson.s synthesis are `(C_(6)H_(5))_(2)O,(CH_(3))_(3)COC(CH_(3))_(3)`.
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How many of the following ethers CANNOT be prepared by Williamson's synthesis? CH_(3)OCH_(2)CH_(3),C_(6)H_(5)OCH_(3), (C_(6)H_(5))_2O, (CH_(3))_(3)COCH_(3),(C_(2)H_(5))_2O, (CH_(3))_(3)C-O- C(CH_3)_(3)

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