Halogens are ………..
a) Cl
b) Br
c) I
d) all of these
In halogenations of alkyne ………. Is used as a catalyst.
a) PCl3
b) NH3
c) HNO3
d) H2SO4
The formula of phosphorus trichloride is……
a) PCL3
b) PCl
c) PCl2
d) PCl5
The addition of halogens to alkyne ( ethyne ) takes place in ……..steps
a) 3
b) 2
c) 4
d) 5
When ethynereacat with chlorine…is produce.
a) 1,2—Dichloroethene
b) 1,2—Dichloromethene
c) 1,2—Dichloro ethane
d) 1,2—Dichloroethyne
Alkynes are prepared by ………
a) dehalogenation of adjacent dihalides
b) dehalogenation of tetrahalides
c) both a & b
d) none of these
