One mole of each of the following alkenes is catalytically hydrogenated. The quantity of heat evolved will be the lowest in the case of

Reaction of isobutylene with concentrated $H_2SO_4 + SO_3$ (oleum) gives:

Write the main product of the given reactions:
$1$. $CH_3-CH=CH-CH_3 \xrightarrow[cold, Na_2CO_3]{KMnO_4}$
$2$. $2,3-$Dimethylbut$-2-$ene $\xrightarrow{Baeyer\ test}$

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).

Identify the product of ozonolysis of $but-2-ene$ from the following:

Write the products of the addition reaction $ >C = C < + XY \to $