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

In the molecule $CH \equiv C - CH = CH_2$,the hybridisation of the $C - C$ single bond is:

Determine the hybridization of the carbon atoms in the following compounds:
$(a)$ $N \equiv C-CH=CH_2$
$(b)$ $HC \equiv C-CH=CH_2$ (Identify the carbon atoms of the single bond $C-C$)
$(c)$ $HC \equiv C-C \equiv CH$
$(d)$ $H_2C=C=C=CH_2$
$(e)$ Buta$-1,3-$diene (as shown in the figure)

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

What is the number of $sp^3$ hybridized carbon atoms in $HO(CH_2)_2CH(CH_3)_2$?

The number of $sp$ and $sp^2$ hybridized carbon atoms in Hepta$-1, 3-$dien$-5-$yne,respectively,are