Question 4 [1.5 pts] Which one of the following statements is correct? The absor

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Question 4 [1.5 pts] Which one of the following statements is correct? The absorption band due to a single B-C bond is more intense that the absorption band due to a single OF bond absorption band due to a single B-C bond is less intense that the absorption band due to a single O-F bond None of the above Question 5 [1.5 pts] Which one of the following statements is correct (assuming faa-se fsia)? d The absorption band due to a Ga-Se bond occurs at a smaller wavenumber than the absorption band due to a Si-CI bond D The absorption band due to a Ga Se bond occurs at a larger wavenumber than the absorption band due to a s-Cl bond None of the above Question 6 [1.5 pts] What is the wavenumber of radiation that has a frequency of 5.874 x 1013 Hz? Enter just the numerical value expressed as a whole number. Don't be alarmed when Canvas adds trailing zeros to the number you type in. This action will not affect the grading of your answer Question 7 11.5 pts] Compound A (C4Hso) decolorizes a solution of bromine in CCla. Independent analysis shows that compound A does not possess any alkenes or phenyl rings. In the presence of Pt and excess H2 compound A undergoes conversion to compound B (Ca2Hz4). How many alkynes does compound A possess? Question 8 [1.5 pts] An NMR signal has been reported to occur 5310 Hz downfield from TMS. Given that the signal's chemical shift is 11.8 ppm what is the operating frequency of the spectrometer (in MHz)? Enter just the numerical value expressed as a whole number. Don't be alarmed when Canvas adds trailing zeros to the number you type in. This action will not affect the grading of your answer. Question 9 [1.5 pts] Which one of the following statements is correct? Hc Hp O Proton Hc is more shielded than proton Ho Proton He is less shielded than proton O None of the above Question 10 [1.5 pts] Which one of the following statements is correct? The Ho Hf Betecthve sensed by proton He is smaller HE than the Beffective sensed by proton HF

Explanation / Answer

Question 4:

Option 3, i.e. None of the above.

Explanation: The electronegativity of B = 2.04, C = 2.55

The electronegativity difference between B and C = 2.55-2.04 = 0.51

The electronegativity of O = 3.44, F = 3.98

The electronegativity difference between O and F = 3.98-3.44 = 0.54

Therefore, the polarity of B-C bond is similar to that of O-F bond.

Hence, The absorption band due to B-C bond and that due to O-F bond will be of almost same intensity.

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