The compound that has the largest H–M–H bond angle (M = N, O, S, C) is :

The correct statement about probability density (except at infinite distance from nucleus) is :

Boron and silicon of very high purity can be obtained through :

The major product formed in the following reaction is :
CH₃CH = CHCH(CH₃)₂ $$\buildrel {HBr} \over \longrightarrow $$