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द्वितीयक अथवा तृतीयक ऐल्कोहॉलों का अम्लीय निर्जलीकरण ईथरों के निर्माण की उपयुक्त विधि नहीं है। कारण स्पष्ट कीजिए।

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अम्लीय निर्जलीकरण में द्वितीयक तथा तृतीयक ऐल्कोहॉल मुख्य रूप से एल्कीन का निर्माण करते हैं। जैसे-
`{:(" OH"),(" |"),(CH_(3)-CH-CH_(3) underset(413 k)overset("conc. "H_(2)SO_(4))(rarr) CH_(3)-CH=CH_(2)+CH_(3)-CH-O-CH-CH_(3)),(" Isopropyl alcohol Propene | |"),(" "(2^(@)" alcohol")" (major product) "CH_(3)" "CH_(3)),(" Di-isopropyl ether"),(" (minor product)"):}`
`{:(" "CH_(3)" "CH_(3)),(" | |"),(CH_(3)-C-OH underset(413 k)overset("conc. "H_(2)SO_(4))(rarr) CH_(3)-C=CH_(2)+H_(2)O),(" | Isobutylene"),(" "CH_(3)),(" t-butyl alcohol"),(" "(3^(@)" alcohol")):}`
अतएव `2^(@)` तथा `3^(@)` ऐल्कोहॉलों का अम्लीय निर्जलीकरण ईथरों के संश्लेषण की उपयुक्त विधि नहीं है।

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