3. Which of the following structures are incorrect? Describe the problem in those that are mcorect. a. CHCH(CH3)2CH2CH b. CH(CH2)SCH c. CH2CH2C(CH3CH2CH2CH3 d. CH3CH2CH(CH3),CH 9. Are the following names correct or incorrect? If they are incorrect, give the correct name. 2. 1,3-Dimeksipertare b. 2-Ethylpropane c. 3-Butylbutane d. 3-Ethyl-4-methyloctane & 2,4-Dimetylpertare f. 1,3-Dimeiro lhexane 3. 1,5-Diodopentane 1. 1,4-Dietnyibetane i 1.6-Dibromo-6-metrs loctane