Which type of hybridisation occurs in ethylene?

Predict the hybridization of each carbon in the molecule of the organic compound given below. Also,indicate the total number of sigma $(\sigma)$ and pi $(\pi)$ bonds in this molecule.
$HC \equiv C-CO-CH_2-COOH$

One of the following conversions results in the change of hybridization and geometry:

Which of the following statements is correct regarding the molecular formula and the hybridization of Xenon in its compound?

In the formation of the $CH_4$ molecule,carbon makes use of:

The hybridisation present in $C_2H_2$ is