Verification of alkenes with concentrated sulphuric acid

Chemicals needed

cyclohexeneGSLEICHT.gif (932 Byte) F GSGESUND.gif (476 Byte) Xn   R 11-22    S 9-16-23-33

sulphuric acid 96 %  GSATZEND.gif (935 Byte) C    R 35   S (1/2)-26-30-45

Instead of cyclohexene one can also use other alkenes.

Equipment needed

test tube

Test procedure



Sulphuric acid combines as a 1,2-addition with the alkene. Cyclohexyl sulphuric acid is formed which dissolves in concentrated sulphuric acid.


Reaction mixture shortly after the addition of sulphuric acid.

Reaction mixture after about 2 minutes.


Derived from experiment 19.3 (D), "Sulfuric Acid", p. 266,[5]