What is the name of this hydrocarbon? 2-dimethylyne 2-methylbutane 4-methylbutene 4,3-methylbutyne 4,4-methylbutane

You can figure this out if you just count the longest chain of carbon. The longest is 4 chains so so you know that the figure is a butane.

It is not a butene because here are no double bounds, you know it is not a butyne because there are no triple bonds. That means that 3rd and 4th choice is not the answer. 

Then next you indicate the placement of the branch. There is only one branch on methyl, so you can rule out the 1st and last choice. 

You are then left with 2-methylbutane.

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

The answer is true a geyser can reach up to 205 degrees fahrenheit