Which of the following is not a member of the same homologous series?

$A$ triene is treated with ozone followed by zinc in acetic acid to give the following three products. What is the structure of the triene?

What sequence of reagents is required to accomplish the following transformation?

Which of the following compounds shall not produce propene by reaction with $HBr$ followed by elimination or direct only elimination reaction?

Consider the following reaction in which the intermediate carbocation loses $H^{+}$ to give the final product:
Which of the following energy profiles best represents the overall reaction?

Which of the following reactions do not represent the major product of given Birch reductions?