Comment on the following statement. “Prevention is better than cure. It’s better to control the population of mosquitoes than using mosquito nets.”

Prevention is better than cure' justify with regard to TDA abuse.

How many of the following nucleophiles are better than NH_(3) for nucleophilic substitution reaction

Identify the correct statements among the following I) The transition elements have partially filled (n-l) d orbitals. II) Cu is a better conductor of electricity than that of Ag. III) Sc^(+3), zn^(+2) are diamagnetic whereas Ti^(+4) is paramagnetic. IV) Transitional elemelilts are less electro-positive than alkalimetals

Which of the following statements are correct (a) the boiling point of a solution is greater than pure solvent (b) the temperature where the vapour pressure of liquid equals to atmospheric pressure is called its boiling point (c) the vapour pressure of pure solvent is less than the vapour pressure of solution containing non volatile solute. (d) the temperature of liquid remained in the container after evaporation is more than before the evaparation