The major warm ocean currents tend to move

a)clockwise. b)counter-clockwise. c)from higher to lower latitudes. d)from lower to higher latitudes

The Northern Hemisphere which is cooler the currents is clockwise and in the Southern Hemisphere which is warmer moves counter-clockwise.  

your answer is B. counter-clockwise.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.