4. Make a model of ethane, CH3CH3. . Are the remaining five hydrogens equivalent? ________. . Are isomers possible? Hydrogens are there ?_ _______Make models of all the possible isomers with the formula C3H7Cl How many are there? 8. What numerical relation can you see between the number of sets of equivalent hydrogens in an alkane and the number of isomers of the chloro – derivatives of that alkane? ______________________ Do you suppose this is always true?