Oils are converted into fats by

In the presence of peroxide,hydrogen chloride and hydrogen iodide do not give anti-Markovnikov addition to alkenes because:

Deviation from Markownikoff's rule occurs in the presence of

Rank the following alkenes in order of increasing $\lambda_{max}$:
$(1)$ $A$ conjugated diene in a bicyclic system.
$(2)$ An isolated diene in a bicyclic system.
$(3)$ $A$ conjugated diene in a bicyclic system (different substitution pattern).

Draw the $cis$ and $trans$ structures of $hex-2-ene$. Which isomer will have a higher $b.p.$ and why?

Ethylene reacts with bromine to form