Electrons, bonding and structure

Which statement about chemical bonding in carbon compounds is correct?

A $π\pi$ -bond is formed by the end-on overlap of p-orbitals.

A carbon-carbon triple bond in ethyne consists of one $σ\sigma$ -bond and two $π\pi$ -bonds.

The H-C-H bond angle in ethane is $120∘120^\circ$ .

A $σ\sigma$ -bond prevents the rotation of the bonded carbon atoms around the bond axis.

Which statement about chemical bonding in carbon compounds is correct?

A $π\pi$ -bond is formed by the end-on overlap of p-orbitals.

A carbon-carbon triple bond in ethyne consists of one $σ\sigma$ -bond and two $π\pi$ -bonds.

The H-C-H bond angle in ethane is $120∘120^\circ$ .

A $σ\sigma$ -bond prevents the rotation of the bonded carbon atoms around the bond axis.

Electrons, bonding and structure Questions