The heat capacity, c p , of liquid carbon disulfide is a relatively constant 78 j / ( mol ⋅ k ) . however, the heat capacity of solid carbon disulfide varies greatly with temperature. from 99 k to its melting point at 161 k , the heat capacity of solid carbon disulfide increases linearly from 44 j/ ( mol. k ) to 57 j / ( mol. k ). the enthalpy of fusion of carbon disulfide is δhfus = 4390 j/mol . the absolute entropy of liquid carbon disulfide at 298 k is s = 151 j / ( mol. k). estimate the absolute entropy of carbon disulfide at 99k .

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d

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.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.