H3C-(CH2)3-COONa -> H3C-CH2-CH2-CH3 -> H3C-CHBr-CH2-CH3 -> H3C-CH2-CH(CH3)-CH(CH3)-CH3 -> H3C-C(H)=CH-CH3
H3C-(CH2)3-COONa -> H3C-CH2-CH2-CH3 -> H3C-CHBr-CH2-CH3 -> H3C-CH2-CH(CH3)-CH(CH3)-CH3 -> H3C-C(H)=CH-CH3