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

Carbon,a Group $14$ element in the Periodic Table,is known to form compounds with many elements. Write an example of a compound formed with:
$(a)$ Chlorine (Group $17$ of Periodic Table)
$(b)$ Oxygen (Group $16$ of Periodic Table)

Look at the figure and answer the following questions:
$(a)$ What change would you observe in the calcium hydroxide solution taken in tube $B$?
$(b)$ Write the chemical reactions involved in test tubes $A$ and $B$ respectively.

Which of the following is a homopolymer?

The structural formula of benzene is:

Which polymer is used for making nonstick cooking vessels?