(chatquestion)...18, 2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid ? (1) (CH,),C=CH-CH,-CH3 (2) (CH,),CH-CH,-CH=CH, (3) (CH),CH-CH-CH=CH, CH, (4) (CH,),C-CH=CH, '3/3

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