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4.        When 2-chloro-2-methylbutane£¨¶þÂȶþ¼×»ù¶¡Í飩 is treated with a variety of strong bases, the products always seem to contain two isomers (A and B) of formula C5H10. When sodium hydroxide is used as the base, isomer A predominatesÕ¼ÓÅ. When potassium t-butoxide is used as the base, isomer B predominates. The proton NMR spectra of A and B are given below.
(a)        Determine the structures of isomers A and B.
(b)        Explain why A is the major product using sodium hydroxide as the base, and why B is the major product using potassium tert-butoxide as the base.
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