Which of the following should have the highest boiling point? CH4 CF4 CBr4 CCl4

Question

Which of the following should have the highest boiling point? CH4 CF4 CBr4 CCl4 Cl4 Which of the following should have the lowest boiling point? C12H26 C10H22 C5H12 C6H14 Which of the following should have the highest surface tension at a given temperature? CF4 CBr4 CCl4 CI4 CH4 Which of the following would have the highest viscosity at room temperature? CH3NH2 C7H14 C8H17NH2 C5H12 C9H18 Which of the following should have the highest boiling point? CH4 CF4 CBr4 CCl4 Cl4 Which of the following should have the lowest boiling point? C12H26 C10H22 C5H12 C6H14 Which of the following should have the highest surface tension at a given temperature? CF4 CBr4 CCl4 CI4 CH4 Which of the following would have the highest viscosity at room temperature? CH3NH2 C7H14 C8H17NH2 C5H12 C9H18 Which of the following should have the highest boiling point? CH4 CF4 CBr4 CCl4 Cl4 Which of the following should have the lowest boiling point? C12H26 C10H22 C5H12 C6H14 Which of the following should have the highest surface tension at a given temperature? CF4 CBr4 CCl4 CI4 CH4 Which of the following would have the highest viscosity at room temperature? CH3NH2 C7H14 C8H17NH2 C5H12 C9H18

Explanation / Answer

1)CCl4 has the highest boiling point.

because it has London dispersion forces (LDF).

2)C5H12 has the lowest boiling point.

because As a rule, the longer the carbon chain, the higher melting point and boiling point. However, the more double bonds you have, the lower the melting point, and also the boiling point so among these compounds C5H12 has smallest carbon chain.

3)Cl4 has the highest surface tension at the given temperature

4)C8H17NH2 has the highest viscocity at room temperature.

because C8H17NH2, higher van der waals forces and thus greater attraction between the molecules, leading to a greater viscosity.

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