Question

what is the closest bond angle around the central atom? 109.5° 120° 180° 90°

Explanation:

Step1: Determine the hybridization of central atom

Carbon (\(C\)) is the central atom. It forms 4 single bonds (3 \(C - H\) and 1 \(C - Br\)). According to valence - bond theory, when an atom forms 4 single bonds, it has \(sp^{3}\) hybridization.

Step2: Recall the bond - angle for \(sp^{3}\) hybridization

For \(sp^{3}\) hybridized atoms, the ideal bond - angle (in a tetrahedral geometry) is \(109.5^{\circ}\). Although there is a slight difference due to the difference in electronegativity between \(H\) and \(Br\), the closest value among the given options is based on the tetrahedral geometry associated with \(sp^{3}\) hybridization.

Answer:

109.5°