How were the compounds that formed when calcium ion solution was mixed with the anion solutions different from the compounds that formed when barium ion solution was mixed with the anion solutions?

Iknow #2 is d. i just need to know why

Based on the equation and the information in the table, what is the enthalpy of the reaction?

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.