(Solved): need help with all of them  30. How many types of proton signal are there in A) 1 B) 2 6) 3 D) ...

30. How many types of proton signal are there in A) 1 B) 2 6) 3 D) 4 31) How many different proton signals do you expect for the molecule shown below? A) 1 B) 2 c) 3 D) 4 32) Which of the following compounds will display a strong broad infrared absorption frequency near \( 3500 \mathrm{~cm}-1 \) (A) Alkene (B)Alcohol (C)ketone (D)Nitrile 33) Which of the following spectroscopic technique can be used to confirm the presence of conjugation in a molecule: A)NMR (B) IR (C) MS (D) UV/VIS 34) Which of the following reactions can be used to synthesize a primary amine? A) Gabriel Synthesis (B) Dieckmann reaction (C) Claisen reaction (D) Aldol reaction 35) Which of the following mechanisms is involved in the dehydration of initialy formed aldol product. (A) SN1 (B) EI (C) \( \mathrm{E} 1 \mathrm{cB} \) D) E2 36)The final step in Hoffman reaction leading to alkene involves which mechanism ? (B) \( \mathrm{El} \) (C) \( \mathrm{E} 1 \mathrm{cB} \) D) E2 37) Nucleophilic aromatic substitution reaction follows two mechanisms: (A) addition-eliminati (B) Elimination-addition. For which mechanism is a benzyne intermediate formed? 38)Which of the following compound class will give a positive haloform test? A) ethanoic acid B) 2-butanol (C) 2-butanal (D) 2-butanone 39) The molecule shown below was published by Okoro et al. Tetrahedron Letters 2008 . How many alpha-hydrogens are present in the molecule?