Question

Alchenle obtinute prin deshidratarea alcoolilor cu formula moleculara C4H10O se oxideaza cu K2Cr2O7(H2SO4) .Separat se oxideaza in aceleasi conditii alcoolii. Stiind ca se utilizeaza 4 moli amestec echimolecular de alcooli cu formula de mai sus , care este raportul volumelor de solutie K2Cr2O7 1/3 M utilizate pentru oxidarea alchenelor si alcoolilor?

Answer 1

CH3-CH2-CH2-CH2-OH ⇒CH3-CH2-CH=CH2 + H2O
CH3-(HO)CH-CH2-CH3 ⇒ CH3-CH=CH-CH3 + H2O
CH3-(CH3)CH-CH2OH ⇒ CH3-(CH3)C=CH2 + H2O
CH3-(CH3)C(OH)-CH3 ⇒ CH3- (CH3)C=CH2 + H2O
CH3-CH2-CH=CH2 +5[O] ⇒CH3-CH2-COOH + CO2 + H2O
CH3- CH=CH-CH3 + 4[O] ⇒ 2CH3-COOH
CH3-(CH3)C=CH2 +4[O] ⇒ CH3- CO-CH3 + CO2 + H2O
K2Cr2O7 + 4H2SO4 ⇒K2SO4 + Cr2(SO4)3 + 4H2O + 3[O]
n1K2Cr2O7 = 5/3 + 4/3 + 2·4/3 = 5moli
CH3-CH2-CH2-CH2-OH + [O] ⇒CH3-CH2-CH2-CH=O +H2O
CH3-(OH)CH-CH2-CH3 +[O] ⇒CH3-CO-CH2-CH3 + H2O
CH3-(CH3)CH-CH2OH + [O] ⇒CH3-(CH3)CH-CH=O + H2O
CH3-(CH3)C(OH)-CH3 + [O] ⇒CH3-(CH3)CO-CH3 +H2O
n2K2Cr2O7 = 4/3 moli
V1/V2 = n1/n2 = 5·3/4 = 15/4