Question

Which statement about 2-methyl-1-propanol. (CH),CHCH,OH, and 1,3-propanediol, HOCH,CH,CH,OH is true? 2.Methyl-1-propanol is more soluble in water than 1.3-propanediol because 2-methyl-1-propanol has a smaller molecular mass. 2-Methyl-1-propanol is more soluble in water than 1,3-propanediol because 2-methyl-1-propanol forms fewer hydrogen bonds with water. O 1,3-Propanediol is more soluble in water than 2-methyl-l-propanol because 1,3-propanediol has a smaller molecular mass. O 1,3-Propanediol is more soluble in water than 2-methyl-l-propanol because 1,3-propanediol can form multiple hydrogen bonds with water

Answer 1

Solution :- * of First we have to consider the molecular mass 2-me hyl-1-propanol and 1,3 - propanediol. molecular mass of (CH₃) CH CH ₂ OH = 74 g molecular mass of HOCH₂CH₂ CH2OH = 76 g. molecular mass of 2-methyl-1-propanol and 1,3- propanediol are almost same. There For molecular mass doesn't expect the solubility of a-me myl-l-propanol and 1,3-propanediol in water, * Now we have to check the Hydrogen bond with water. (CH₃ % CH CHa has one OH part and Chan ban form anatyda Bond with Hydrogen of water. HOCH.CH, OH has two oH parts and that Gn - Form bond with Hydrogen of water. 1 3 - propanediol Can Foom two Hydrogen Bond! with water while a-methyl-1-propanol Forms Only one Hydrogen bond with water.

The Number of Hydrogen bond increases solubility in watur By increasing Atraction Between - solute and water. So, 1,3-propanediol is more soluble in water than 2-methyl-1- propanol. Hence, 1,3- propanediol is more soluble in water than a-methyl-1-propanol because 1,3 propanol Can Form multiple Hydrogen - Bonds with water.

structure of 2-methyl propanal I - I H-C-H C - = H - ( cla C- H U ヘ - I 2-methyl propanal. E