Which of the molecules are linear?

What is the molecular geometry of a molecule with 4 outer atoms and 1 lone pair on the central atom?

Give the number of total electron groups, the number of bonding groups, and the number of lone pairs for the geometry depicted in (a).

Indicate the electron pair geometry and the molecular geometry for each of the six compounds.

Give the number of total electron groups, the number of bonding groups, and the number of lone pairs for the geometry depicted in (a).

What is the molecular geometry of a molecule with 4 outer atoms and 1 lone pair on the central atom?