The $IUPAC$ name of the given compound is:

Which one is the common name of the compound $CH_2=CH-CHO$?

Give the name and structure of the following compounds:
$(i)$ Methanal $(ii)$ Ethanal $(iii)$ $2$-Methylpropanal $(iv)$ $3$-Methylcyclohexanecarbaldehyde $(v)$ $2$-Methoxypropanal $(vi)$ Pentanal $(vii)$ Prop-$2$-enal $(viii)$ Benzene-$1,2$-dicarbaldehyde $(ix)$ $3$-Bromobenzaldehyde

Which structure represents $3-$methyl$-2-$pentanone?

What is the physical state of formaldehyde at room temperature?

Which of the following statements is true for the carbonyl group?