The ratio of the number of $\sigma$ and $\pi$ bonds in benzene is equal to:

Number of $\sigma$ and $\pi$ bonds present in $CH_3-CH=CH-C\equiv CH$ are

Considering the $x$-axis as the internuclear axis,which of the following will not form a sigma $(\sigma)$ bond and why?
$(a)$ $1s$ and $1s$
$(b)$ $1s$ and $2p_{x}$
$(c)$ $2p_{y}$ and $2p_{y}$
$(d)$ $1s$ and $2s$

How is the $F_2$ molecule formed?

$A$ molecule $(X)$ has $(i)$ four sigma bonds formed by the overlap of $sp^2$ and $s$ orbitals,(ii) one sigma bond formed by $sp^2$ and $sp^2$ orbitals,and (iii) one $\pi$ bond formed by $p_z$ and $p_z$ orbitals. Which of the following is $X$?

What type of bond is formed by the overlapping of $2p_x$ and $2p_y$ orbitals? Why?