Please explain the technique for getting each answer. Thanks In each of the foll

Question

Please explain the technique for getting each answer.

Thanks

In each of the following groups of substances, pick the one that has the given property AND justify your answer. Clearly label the appropriate substance, please. A. Highest boiling point: HBr, Kr, or Cl_2 B. Highest freezing point: H_2O, NaCl, or HF C. Lowest vapor pressure at 25 degree C: Cl_2, Br_2 or I_2 D. Lowest freezing point: N_2, CO, or CO_2 E. Lowest boiling point: CH_4, CH_3 CH_3, or CH_ CH_2 CH_3 F. Highest boiling point: HF, HCl, or HBr

Explanation / Answer

A] Highest boiling point in H-BR --> Because it has london dispersion forces as well as dipole dipole forces where Kr and Cl2 has only london dispersion forces

B] NaCl has the highest freezing point , because NaCl is the ionic compound . The ionic bond in NaCl is stronger attractive force than any other force

C] I2 is lowesr vapor pressure because , I2 is the largest molecule and have larger disperion forces compared with other molecules which prevents the substance from change into vapour.

D] N2 has the lowest freezing point because it has only london dispersion forces and smallest molecules compared with other molecules given

E] CH4 has the lowest boiling point

Higher the carbon chain higher will be the londondispersion forces

F] HF has highest boiling point because it has the strongest dipole dipole forces due to hydrogen bonding .

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