Fill in the blank Carbon dioxide emissions will in the next century and global temperatures will increase decrease or stay the same is the options on both blanks

Can someone me with questions 12 and 13 plz.

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.

Which of these is a physical property