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4. a) CH3-CH2-CH=CH-CH2-CH3 b) CH3-CH=CH-CH3 c) CH3-(CH3)C=CH-CH2-CH3 d) CH3-(CH3)C=CH-CH3 e) CH3-CH2-(CH3)C=C(CH3)-CH2-CH3
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4. a) CH3-CH2-CH=CH-CH2-CH3 b) CH3-CH=CH-CH3 c) CH3-(CH3)C=CH-CH2-CH3 d) CH3-(CH3)C=CH-CH3 e) CH3-CH2-(CH3)C=C(CH3)-CH2-CH3