This question belongs to organic chemistry plzz reply with explanation as soon as possible....

Dear student ....Baeyer`s reagent is used in organic chemistry as a qualitative test for the presence of unsaturation, such as double or triple bonds.Here, ethene and ethyne will decolourise baeyer`s reagent .Ethyne gives tollen`s test due to presence of acidic hydrogen but ethene does not .Therefore , ethene is the answer ....With Regards ....Mahima....(Askiitians Forum Expert )