You are given a bottle of an organic liquid and told it must be either cyclohexa

Question

You are given a bottle of an organic liquid and told it must be either cyclohexane or l-hexane. Which of the following statements is (are) true about these two compounds? The two compounds can be differentiated by their mass spectra because they will have molecular ion peaks at different m/z. l-Hexane will show an absorption at 1650 cm^-1 but cyclohexane will not. Both cyclohexane and l-hexane will show C-H absorptions at about 2950 cm -I. Statements B (l-Hexane will show an absorption at 1650 cm^-1 but cyclohexane will not) and C (Both cyclohexane and l-hexane will show C-H absorptions at about 2950 cm^-1) are both true. Statements A (The two compounds can be differentiated by their mass spectra because they will have molecular ions at different masses), B (l-Hexane will show an absorption at 1650 cm^-1 but cyclohexane will not), and (Both cyclohexane and l-hexane will show C-H absorptions at about 2950 cm^-1) are all true. Which of the following statement(s) is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 69 and shows a prominent peak in its IR spectrum at 2250 cm^-1? The compound has a molecular mass of 70. The compound contains a C=O group. The compound contains a cyan or alkyne group. Both (The compound has a molecular mass of 70) and (The compound contains a C=O group) are true statements. Both (The compound has a molecular mass of 70) and (The compound contains a cyan or alkyne group) are true statements. 2, 3-dimethylbutane gives a base fragment peak at m/z = 43. Which of the following is the most probable structure of the fragment ion? I II III IV

Explanation / Answer

(27) option (D) is correct. statements both (B) & (C) are correct

(28) option (E) is correct . statements (A) and (C) are correct

(29) option (D) is correct . in fragmentation of 2,3-dimethyl butane, tertiarybutyl cation is formed and due to its most stability, it has become most probable fragment in mass spectra

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