Осуществить цепочку превращений a)c⇒cac2⇒ch≡ch⇒ch2=ch2⇒ch3-ch3⇒co2 б)co⇒ch3-ch2-ch3⇒ch2=ch-ch3⇒ch2(br)-ch(br)-ch3⇒ch≡c-ch3⇒ch3-c=o-ch3

А) 2C+Ca=CaC2
CaC2+2H2O=Ca(OH)2+HC≡CH
HC≡CH+H2 = CH2=CH2
CH2=CH2+H2 = CH3-CH3
2CH3-CH3+7O2=4CO2+6H2O
Б) 3CO+7H2=CH3-CH2-CH3+3H2O
CH3-CH2-CH3 = CH2=CH-CH3+H2
CH2=CH-CH3+Br2= CH2(Br)-CH(Br)-CH3
CH2(Br)-CH(Br)-CH3+2KOH=2KBr+2H2O+HC≡C-CH3
HC≡C-CH3+H2O = CH3-C(O)-CH3