The hybridisation state of chlorine in $ClF_3$ is

What is the shape of the molecule $CH_2 = CH - CH = CH_2$?

Identify the molecules which have $sp$-hybridised carbon$(s)$ from the list given below:
$I$. Ethane nitrile $(CH_3CN)$
$II$. Buta$-1,3-$diene $(CH_2=CH-CH=CH_2)$
$III$. Propan$-1,2-$diene $(CH_2=C=CH_2)$
$IV$. Ethyne $(HC \equiv CH)$
$V$. Benzene $(C_6H_6)$

The correct order of decreasing $H-C-H$ bond angle in the following molecules is:

Octahedral molecular shape exists in .......... hybridisation.

In $SO_2$,$NO_2^-$ and $N_3^-$ the hybridizations at the central atom are respectively $:$