(i) C4H8 (an alkene) on ozonolysis only give one organic product means it has the double bond as follows H3C−CH=CH−CH3 i.e., show i.e., Symmetry about C=C (ii) As trans C4H8 i.e., trans but-2-ene can give Meso compound with Br2 in CCl4, which is optically inactive. Hence, option (b) is the correct answer. Note cis but-2-ene give ±2,3 dibromobutane on treatment with Br2 in CCl4.