TT which of the following is phenol? 1. CH2=CHCH2OH 2. CH2OHCH2OH 3. C6H5CH2OH 4. C6H5OH Select one: O a 3 o b. 4 Oc. 2 od d. 1 Dehydration of alcohols means? Select one a. removing water molecule . b. adding water molecule b. c. synthesis of alcohol Aldehydes and ketones react with 2,4- dinitrophenylhydrazine gives a yellow to orange precipitate. Select one: True False