Organic chemistry

1.     Carboxylic acids can generally be prepared by various methods. Which of the following methods in not suitable for making carboxylic acids

a)     By the oxidation of primary alcohols

b)    By the hydrolysis of nitriles

c)     By the carbonation of Grignard reagent

d)    By the hydrolysis of primary amines

2.     Monocarboxylic acids can exists as dimer because of

a)     Dipole-dipole attraction

b)    Hydrogen bonding

c)     Van der waals forces

d)    Cohesive forces

3.     Ethanoic acids reacts with PCl₅ to give ethanoyl chloride, HCl and a third compound. What is the third compound

a)     H₃PO₃

b)    POCl₃

c)     SO₂

d)    COCl₂

1.d

2.b

3.b