9. Select the correct name for the following compound. (A) 3-ethyl-2,3-dimethyl-1-propanol (B) 2,3,4-trimethyl-1-butanol (C) 2,3-dimethyl-1-pentanol (D) 3,4-dimethyl-5-pentanol (E) none of these

7. Which of the following statements is incorrect? (A) NF3 is a polar molecule. (B) The hybridization of the central atom is sp3 in ? (C) According to the molecular orbital model, the bond order of P2 molecule is three. (D) A material is made from Al, Ga, and As. The mole fraction of each element is 0.25, 0.26, and 0.49, respectively. This material would be an p-type semiconductor. (E) none of these

9. Select the correct name for the following compound.
(A) 3-ethyl-2,3-dimethyl-1-propanol
(B) 2,3,4-trimethyl-1-butanol
(C) 2,3-dimethyl-1-pentanol
(D) 3,4-dimethyl-5-pentanol
(E) none of these

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