How many of the following ethers can not be prepared by Williamson's s – InterviewSolution

1.	How many of the following ethers can not be prepared by Williamson's synthesis ? CH_(3)-O-CH_(2)CH_(3),(C_(2)H_(5))_(2)O,(CH_(3))_(3)C-O-CH_(3),(CH_(3))_(3)C-O-CH_(2)CH_(3),(CH_(3))_(3)C-O-C(CH_(3))_(3), C_(6)H_(5)-O-CH_(3),C_(6)H_(5)-O-CH_(2)CH_(3),(C_(6)H_(5))_(2)O,C_(6)H_(5)CH_(2)-O-C_(6)H_(5)
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