Select the correct statement.

Which compound contains $1^o, 2^o, 3^o$ and $4^o$ carbon atoms?

State whether the following statements are True or False:
$(i)$ There is a huge number of organic compounds because the carbon atom is very small.
$(ii)$ The number of organic compounds is huge because of catenation.
$(iii)$ Organic compounds are in a huge number because of valency.

Maximum enol content is in

Vanillin,a compound obtained from vanilla beans,has a total sum of oxygen atoms and $\pi$-electrons equal to . . .

Homologues have different