Which of the following is/are TRUE about properties of alkanes?A. Alkanes contain only non-polar C-C and C-H bonds.B. Alkanes have high melting and boiling points.C. Alkanes are soluble in water.D. Alkanes have weak intermolecular forces.
Question
Which of the following is/are TRUE about properties of alkanes?A. Alkanes contain only non-polar C-C and C-H bonds.B. Alkanes have high melting and boiling points.C. Alkanes are soluble in water.D. Alkanes have weak intermolecular forces.
Solution
The correct statements about the properties of alkanes are:
A. Alkanes contain only non-polar C-C and C-H bonds. This is true. Alkanes are hydrocarbons, meaning they only contain carbon (C) and hydrogen (H) atoms. The bonds between these atoms are non-polar covalent bonds.
D. Alkanes have weak intermolecular forces. This is also true. Alkanes are non-polar molecules, so they only have weak dispersion forces (also known as London forces) between their molecules.
The incorrect statements are:
B. Alkanes have high melting and boiling points. This is false. Due to their weak intermolecular forces, alkanes generally have low melting and boiling points.
C. Alkanes are soluble in water. This is also false. Alkanes are non-polar and water is polar. According to the rule of "like dissolves like", non-polar substances do not dissolve in polar substances, so alkanes are not soluble in water.
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