Question 2 (0.4 points) How can you tell the difference between a cis and a tran

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Question 2 (0.4 points) How can you tell the difference between a cis and a trans alkene using 1h NMR? O cis won't have any protons O trans won't have any protons cis will have a smaller coupling constant O trans will have a smaller coupling constant Question 3 (0.4 points) If the 300 MHz 1H NMR spectrum of a compound has a doublet with one at 6.10 ppm and the second signal at 6.05 ppm, the value of the coupling constant is O 15 Hz O 5 Hz O 1.5 Hz O 10 Hz Question 4 (0.4 points) The product that you isolate at the end of this week's lab is a white solid melting point of 80-88 C. The identity of this product is dibenzylacetone True O False Question 5 (0.4 points) What is the major product (the dehydration product) of the following reac O B

Explanation / Answer

2) Trans coupling (range: 11 to 19 Hz) is greater than cis coupling (range: 5 to 14 Hz). Therefore, the option cis will have a smaller coupling constant.

3) For calculating coupling constant for a doublet = the difference between the frequency of the 2 peaks x frequency of NMR machine (300MHz). Therefore, (6.10-6.05)x300 = 15Hz.

4) The statement is false because dibenzylideneacetone is a pale-yellow solid and its melting point reported is 110-1110C.

5) B is the major product.

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