①(CH3)2C=O+HCN→(CH3)2C(OH)CN
②(CH3)2C(OH)CN+CH3OH+H2SO4→CH2=C(CH3)COOCH3+NH4HSO4
新法合成的反应是:③CH3C≡CH+CO+CH3OH CH2=C(CH3)COOCH3
下列说法错误的是( )