Gas cloud 1 is likely to form a star. Gas cloud 2 is not. Based on this information, match the glven conditions with each cloud. Its temperature stays well below 14 million Kelvin. Its volume shrinks and density increases due to gravity. Its temperature surpasses 14 million Kelvin. It is spread out, with a greater volume and lesser concentration of elements. Its hydrogen atoms shed their electrons. Its hydrogen atoms retain their electrons. gas cloud 1 gas cloud 2

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

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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.