Question

16,2 g alchina aditioneaza bromul din 480g solutie 20%. Identifica alchina si scrie izomerii care pot da reactie de substitutie.

Answer 1

 c=mdx100.ms
20/100= md/480---> md= 96gBr2

M,Br2=160g/mol
n= m/M=96/160mol= 0,6molBr2 

CnH2n-2 + 2Br2---> CnH2n-2Br4
1mol.........2mol
x...............0,6mol
x=0,3mol alchina

0,3mol alchina...........16,2g
1mol...........................M=54 g/mol

14n-2=54---> n=4---> butina
CH≡C-CH2-CH3     1 BUTINA
CH2-C≡C-CH3        2 BUTINA
   1 BUTINA  da reactie de substitutie in pozitia alilica  CH≡C-CH2-CH3