Rank the following alkenes in order of decreasing heats of hydrogenation (largest first):
$1$. $1-$butene
$2$. $2-$methyl$-2-$butene
$3$. trans$-2-$butene
$4$. cis$-2-$butene

In the reaction $CH_2=CH_2$ $\xrightarrow{HOCl} M$ $\xrightarrow{R} HO-CH_2-CH_2-OH$,where $M$ is a molecule and $R$ is a reagent,$M$ and $R$ are:

What is the product of the following reaction?
$1,2-\text{dimethylcyclopentene} \xrightarrow[2. NaHSO_3]{1. OsO_4} \text{Product}$

Given below are two statements.
Statement $I :$ The presence of weaker $\pi$-bonds makes alkenes less stable than alkanes.
Statement $II :$ The strength of the double bond is greater than that of carbon-carbon single bond.
In the light of the above statements,choose the correct answer from the options given below.

Allyl chloride on dehydrochlorination gives:

What is obtained when propene is treated with $N$-bromosuccinimide?