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

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

Electrophilic addition on a carbon-carbon double bond involves the intermediate formation of a more stable carbocation. This statement is called

Which of the following products is not formed during the reaction: $CH_3-CH(CH_3)-CH=CH_2 \xrightarrow{Br_2/aq. NaCl}$?

$A$ compound '$X$' on ozonolysis forms two molecules of $HCHO$. Compound '$X$' is

Which of the following compounds is produced when $CH_2 = CH - (CH_2)_2COOH$ reacts with $HBr$ in the presence of peroxides?