In the organic compound $CH_2=CH-CH_2-CH_2-C\equiv CH$,the pair of hybridized orbitals involved in the formation of the $C_2-C_3$ bond is:

The enolic form of acetone contains

Number of $sp$ hybridised carbon atoms in the given compound $CH_2=CH-C\equiv C-CH_2-CN$ is:

In which of the following species is the underlined carbon having $sp^3$ hybridisation?

$(a)$ Discuss the concept of hybridization. What are its different types in a carbon atom.
$(b)$ What is the type of hybridization of carbon atoms marked with a star in the following structures:
$(a)$ $\overset{*}{C}H_2 = CH - C(=O)OH$
$(b)$ $CH_3 - \overset{*}{C}H_2 - OH$
$(c)$ $CH_3 - CH_2 - \overset{*}{C}H = O$
$(d)$ $\overset{*}{C}H_3 - CH = CH - CH_3$
$(e)$ $CH_3 - \overset{*}{C} \equiv CH$

In $3, 3-$dimethylhex$-1-$ene$-4-$yne,there are $......... sp^3, ......... sp^2$ and $........ sp$ hybridised carbon atoms respectively $:$