Question

QUESTION 18 Which of the following repente react with 2.butyne to form (7) bune! 1. H/Lindlar catalyst 2. BH3: followed by CH3COOH N/NH Only only only 3 only 1 and 2 QUESTION 19 In which of these Lewis structures would the sulfur be assigned a formal charge of +17 che CHE CH-S-6: CH, -- CHE --- 1 2 1 2 3 QUESTION 20 Which of the following Newman projections represents the most stable conformation of 2,3-dimethylbutane? CH сн. CH CH H. H Н. HC, VH H HT "CH, H HI сн нс CHE CH 1 3 资委 "CH3 CH 2 Click Save and Submit to save and submit. Click Save All Answers to save all answers

Answer 1

ld (05 etz - ( = cetly 2. Butyhe City est, (2) 2. butene @ Kindlar catalyst/1h © Hy / followed Na Nity by CH₃COOH for transformation 2 - butyne to (2)-2-butene optim only I and to are suitable, Lindlar catalyst is a mixture of 5% Pd - CaCO3 Pd(0Ach and guinstine, addition & Lindlar catalyst is used then takes place to allkyne leads to cis (2) product. where as if If Btz/ followed by Ct₂00h is 35 used then also is product (&) formed. с – с 7 syn addition of Blitz SUNDAY 11 2eH3-C=(-elt the. CH₃ BH3 B H₂ Ctz-C=(- CH₂ R: Cty tl = ct (113 100 4 \с, н HI е. 7 'R "C H₂l But if Na/Nlt, used then trans prod out will form.

"3 utz Na nar le - e - C- CH3 6.00 Do & more stable than City CH₃ CH₃ — С. се I 7.00 HANH Ub Utz Notes H Ng C=C alty С– С. Hz (=C 수 CH 3 est trans of (2) product major. • One who competes cannot be much above his competitor
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