[Sush_eera]

1) When ethylbenzene reacts with chlorine it forms two isomers C and D? Draw the structure of isomers C and D.
My ans: Attachment
2) Suggest the conditions needed to obtain each one from ethylbenzene and, in each
case, state the type of reaction undergone.
My ans: the type of reation undergoing in both cases is ADDITION REACTION
the conditions for both cases are : UV light and Cl_2(g)

C reacts with hot concentrated alcoholic potassium hydroxide to give phenylethene but, with aqueous sodium hydroxide, it forms E, C8H10O. E gives a yellow precipitate with alkaline aqueous iodine.
D is inert towards aqueous sodium hydroxide but is oxidized by aqueous potassium manganate(VII) to an acid F, C7H5ClO2.
3) Draw the structures of E and F. Deduce their structures giving a full reasoning for your answer.
my ans: attachment

I drew them on paint so i am extremely sorry for bad drawings... 

[AWK]

the type of reation undergoing in both cases is ADDITION REACTION

The reaction has another name.
concerning drawing - forum use SMILES
http://www.chemicalforums.com/index.php?topic=63707.msg228919#msg228919
http://www.chemicalforums.com/index.php?topic=63757.msg232494#msg232494

[orgopete]

Hint, C and D are isomers, but from two different reactions. One is an electroph.... reaction

[sjb]

Hint, C and D are isomers, but from two different reactions. One is an electroph.... reaction

Are you sure? I thought it was the same reaction for both?

[orgopete]

Hint, C and D are isomers, but from two different reactions. One is an electroph.... reaction

Are you sure? I thought it was the same reaction for both?

What is your D?