text: what product is formed between cyclohexene and concentrated sulphuric acid? textbook suggests the product should be cyclohexanol but what was observed was a charred black mass. c6h10 + h2so4 --> c6h11oh + so3 2-  the double bond breaks and takes the hydrogen plus a hydroxide ion according to the book.  the black mass is carbon solid, where the h2so4 acts as a dehydrating agent, but to what i cannot tell.