Explain the types of substitution reaction ?

For the following bond cleavages use curved-arrows to show the electron flow and classify each as homolytic or heterolytic fission. Identify reactive intermediate produced as free radical, carbocation and carbanion ?
(a) \({ CH }_{ 3 }O-O{ CH }_{ 3 }\longrightarrow { CH }_{ 3 }\overset { \bullet }{ O } +{ CH }_{ 3 }\overset { \bullet }{ O } \) 
(b)

(c)

(d)

An organic compound (A) has a molecular formula C₂H₆0 it is one of the primary alcohol. A reacts with acidified potassium dichromate to give B. B on further undergoes to oxidation reaction to give C. C on reacts with SOCl₂ to give D which is chlorinated product. Identify A,B,C and D, explain with equation.

An organic compound (A) of a molecular formula C₂H₄ which is a simple alkene. A reacts with dil H₂SO₄ to give B. A again reacts with Cl₂ to give C. Identify A,B and C and write the equations.

Complete the reactions and identify the products.
(i)

(ii)
\({ CH }_{ 3 }-\underset { \overset { | }{ Cl } }{ C } H-{ CH }_{ 3 }\overset { { H }^{ + }/{ K }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 } }{ \longrightarrow } A\overset { (O)) }{ \longrightarrow } B\)