The conversion of CICH=CHCI to CI2C=CC12 can be carried out with: C12 / H20
C12
C12/ hv
C12 / aq. NaOH​

I think third C12/hv is right answer

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary