please answer all parts if possible !!

Question 1 1 pts How is spectroscopy used to determine the structure of an unknown compound? Disparate pieces of information are put together to make a coherent structure proposal. Pictures accurately showing the structure of the compound are produced, O Guesses about the structure are made until a reasonable structure that would produce the known physical properties is created Properties of the compound are compared to the properties of known compounds until a match is found, The compound is subjected to a series of chemical reactions until its structure is determined. D Question 2 1 pts Which of the following is not a question asked when using spectroscopy to determine the structure of an unknown molecule? How are the molecular pieces connected? What atoms make up the compound? What functional groups are present? Why does the molecule have particular chemical reactivity? Question 3 1 pts a Which of the following is a reasonable molecular formula for a hydrocarbon that produces a molecular ion peak of 112 in a mass spectrometry analysis? O Cg Hio OCH CH18 O CyH26 D Question 4 1 pts What element would cause a compound to produce two molecular ion peaks of close to equal height in a mass spectrometry experiment? hydrogen bromine lodine carbon chlorine