In the given reaction,what will be the structure of $Z$?

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

For the synthesis of $but-1-ene$,$CH_3MgI$ should be treated with:

Identify the correct statements with respect to $cis/trans$-but$-2$-ene from the following:
$I$. $cis$-but$-2$-ene is more polar than $trans$-but$-2$-ene
$II$. Melting point of $cis$-but$-2$-ene is greater than that of $trans$-but$-2$-ene
$III$. Boiling point of $cis$-but$-2$-ene is greater than that of $trans$-but$-2$-ene
Correct answer is

Consider the following statements: $A$ hydrocarbon of molecular formula $C_5H_{10}$ is a
$I.$ monosubstituted alkene
$II.$ disubstituted alkene
$III.$ trisubstituted alkene
Which of the following statement$(s)$ is(are) correct?

Which of the following acyclic compounds will react fastest with $Br_2$ gas?