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Which of the following statements is not correct ?A. Pentane-`1,5`-diol is soluble while pentan -`1-ol`only slightly soluble in waterB. Cyclohexanol is less soluble in water than henxan -`1-ol`C. Isomeric alcohols have different boiling pointsD. None of these |
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Answer» Correct Answer - B Cyclohexanol is more soluble in water because the alkyl part in cyclohexanol is more compact than in hexan-1-ol. Thus , its `OH` group is more exposed and available for `H`-bonding with water. In addition, its small compact shape results in fewer water -water `H`-bonds being broken. (1) The additional `OH` group increases the number of `H`-bonds between water and the diol. (3) For example , the decreasing order of boiling point is `CH_(3)(CH_(2))_(3)CH_(2)OHgtCH_(3)underset(OH)underset(|)(CH)overset(CH_(3))overset(|)(CH)CH_(3)gtCH_(3)underset(OH)underset(|)overset(CH_(3))overset(|)(C)CH_(2)CH_(3)` As the branching increases (in isomeric alcohols), the shape becomes more compact and spherical . There is then less surface contact available for van der Waals attractive forces. |
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