In the given structure,the number of $sp$ and $sp^{2}$ hybridized carbon atoms present respectively are:

The hybridisations of carbon-$2$ in $P$ and $Q$ are respectively:

Which of the following compounds contains carbon atoms with both $sp$ and $sp^2$ hybridization?

$(a)$ 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:
$(a)$ $\overset{*}{C}H_2 = CH - C(=O)OH$
$(b)$ $CH_3 - \overset{*}{C}H_2 - OH$
$(c)$ $CH_3 - CH_2 - \overset{*}{C}H = O$
$(d)$ $\overset{*}{C}H_3 - CH = CH - CH_3$
$(e)$ $CH_3 - \overset{*}{C} \equiv CH$

The lone pair of electrons in the given carbanion, $CH_{3}C\equiv C^{-}$, is present in which of the following orbitals?

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