The bond length of the $C-H$ bond in ethene is ...... $pm$.

The product $(P)$ of the following reaction 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?

With oxalic acid,glycerol at $260\,^\circ C$ gives

Which of the following reagents is used to detect carbon-carbon multiple bonds?

One mole of alkene $\underline{X}$ on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The $IUPAC$ name of $\underline{X}$ is