Tetravalence of Carbon — Prelims Questions

Which of the following statements about the hybridization of carbon in different organic molecules is INCORRECT?

What is the approximate bond angle around an $sp^2$ hybridized carbon atom?

How many sigma ($sigma$) and pi ($pi$) bonds are present in a molecule of propyne ($CH_3-C\equiv CH$)?

Which of the following statements correctly describes the geometry and bond angle of a carbon atom involved in a triple bond?

Which of the following properties is NOT directly a consequence of carbon's tetravalence?

What is the percentage of $s$-character in the hybrid orbitals of an $sp$ hybridized carbon atom?