What is a significant ethical dilemma that a drug designer may face? a. a new drug effectively treats skin cancer but may cause minor skin rashes during treatment b. a new drug effectively fights allergies but causes drowsiness. c. a new drug treats hypothyroidism but destroys the thyroid; this means that patients will be on the drug indeterminately d. a new drug effectively lowers blood pressure but may cause headaches

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

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.