Which of the following is an aromatic hydrocarbon?

30) Which of the following is the most stable diene? L. IV. A)I B) C)III D)IV E) V 31) Which of the following is an aromatic hydrocarbon? IV -CH A)I B C)ID)IVE) V 32) Which of the following conjugated dienes will not react with a dieneophile in a Diels-Alder reaction? Π. IV A) I B)11 C)111 D) IVE) I and III 33) The conjugate acid of the compound shown below is B) aromatic D) antiaromatic. E) none of the above.

21) Which of the following pairs are resonance contributors? I. CH2-CHCH3 and △ Ⅱ. CH2=C–H and CH-CH : он CH3-8-H Ill CH3-C-H and CH-C-H o: IV. CH-c-Hand CH3-C-H V. CH3-0-CH3 and СНСњон A)I B)Il C)III D) IV EV

51) How many allylic hydrogens does the following compound have? CH2-CH-CH-CH A)2 B)3 C)4 D)5 E)zero 52) Which has correctly drawn arrows? A) CH CH-CH CH B) C) D) E)