Name Date 27. The IUPAC name for the molecule below is H2 Br (a) cis-2,4-dibromo
ID: 537625 • Letter: N
Question
Name Date 27. The IUPAC name for the molecule below is H2 Br (a) cis-2,4-dibromocyclopentane trans-2,4-dibromocyclopentane Aec) 3-dibromocyclopentane sd) trans-13-dibromocyclopentane 28. The base peak in a mass spectrum is always (a) the most stable radical (c) the most stable alkene (b) the most abundant cation (d) the molecular ion 29. Which one of these statements about mass spectrometry is not correct? (a) Fragmentation occurs preferentially at the weakest bond. (b) Fragmentation favors formation of the more stable carbocations. (c) All products of fragmentation can be detected by the spectrometer. (d) a-Cleavage is a homolytic bond cleavage. 30. A reaction where AG is negative is classified as (a) exothermic (c) endothermic (b) exergonic (d) endergonic 31. In a molecule of phosgene (CIzc not shown geometrically correc), the bond angle is most nearly (b) 109° (a) 90° (c) 120. (d) 180Explanation / Answer
27. Since Br atoms are oriented in opposite direction, it is trans. Counting starts from one Br, then other will come on 3rd position
Name is 1,3- trans- dibromocyclopentane
option D is the correct answer
28. In mass spectra, only cations are detected. Most abundent cation appears as base peak in mass spectra.
Option b is correct answe
29. Option c is wrong. Nuetral products formed during fragmentation cannot be detected.
30. If deltaG is negative for a reaction, the reaction is exergonic. Option b is correct
31. C in phosgene is sp2 hybridized. The expected bond angle is 120. Option C is correct
As per policy of Chegg one question or 4 sub-parts are answered.
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