An organic compound (A) on ozonolysis followed by treatment with zinc dust and water give product P , which can be used to preserve biological specimens. Identify A .

Step-by-step solution

Formaldehyde ( HCHO ) is used to preserve biological specimens. It changes the tissue on a molecular level, so that the bacteria can't feed on the tissues. Thus, among the given compound only ethene (A) on ozonolysis followed by treatment with zinc dust and water give formaldehyde (P) . The reaction involve is as follows.