ch3-ch(ch(ch3)ch2ch3)-ch2coona+naoh=
Ch3-ch(ch(ch3)ch2ch3)-ch2coona+naoh= Ch3-ch(ch(ch3)ch2ch3)-ch3+na2co3
NaOHводный то С3(ОН)С4, если спиртовой то С3=С4