In which of the following compounds will the angle between two covalent bonds be the largest?

The shapes of methane,ethene and ethyne molecules are,respectively

What are the hybridization type and molecular shape of the central atom in $BrF_5$,respectively?

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 $(C_6H_6)$

What is the hybridization state of the central atom in the conjugate base of $NH_4^{+}$ ion?

The geometry and the type of hybrid orbital present about the central atom in $BF_3$ is