Which substance is produced by the reduction of methanal in the presence of a palladium catalyst?

Which of the following is not a straight chain hydrocarbon?

What is the percentage of sulfur used in vulcanized rubber for battery casings (in $\%$)?

An atom of an element contains six electrons in its valence shell. This element is the second major component of air. It exists as a diatomic molecule.
$(i)$ Identify the element.
$(ii)$ Show the bond formed between two atoms of this element.
$(iii)$ Write the nature of the bond between the two atoms.

Ethane,with the molecular formula $C_{2}H_{6}$,has

Write the name and structure of an alcohol with three carbon atoms in its molecule.