Question

O alchena, A, are densitatea in raport cu aerul 1,453. Determina alchena A, si completeaza urmatoarele ecuatii ale reactiilor chimice:
a).A+Cl₂----500°C--->
b).A ---KMn0₄/H+--->
c).A+H₂0 ---H₂So₄--->

Answer 1

Din densitate, se calculeaza M, masa molara a alchenei CnH2n
1,453= M/M,aer--> M= 1,453x29g/mol=42g/mol
Din egalitatea M= 14n, deduc  n
42=14n>-----> n=3---> propena
CH2=CH-CH3   + Cl2, la 500⁰----> CH2=CH-CH2Cl  substitutie alilica
CH2=CH-CH3  +5O---> CO2+H2O+CH3COOH    in mediu acid
CH2=CH-CH3 +HOH---->CH3-CHOH-CH3