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

With reference to the carbonyl group,which statement$(s)$ is/are correct?
$A$. Carbonyl carbon is electrophilic
$B$. Carbonyl carbon is nucleophilic
$C$. Carbonyl oxygen is electrophilic
$D$. Carbonyl oxygen is nucleophilic

Match the formulas in column-$I$ with their corresponding names or functional group classifications in column-$II$.

column-$I$	column-$II$
$(i)$ $CH_3COCH_3$	$(a)$ Aldehyde,$(b)$ Ketone
$(ii)$ $CH_3CH_2CHO$	$(c)$ Propanone,$(d)$ Oxo
$(iii)$ $CH_3CH_2COOH$	$(e)$ One,$(f)$ al
	$(g)$ Propanoic acid

Which of the following compounds does not contain an $-OH$ group?

What is the compound called if the remaining two valencies of a carbonyl group are satisfied by two alkyl groups?

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