MolSynapsequestion bank
MolSynapse / Question bank / Structural Identification and Practical Organic Chemistry / Degree of unsaturation and spectroscopic clues
JEE Advanced levelSingle correct optionDifficulty 3 of 3si097

A compound shows molecular ion peaks at m/z 186, 188 and 190 in the ratio about (lowest mass peak is from Br only). It contains only C, H and Br, is saturated and acyclic, and gives a single signal in its H NMR spectrum. The compound is

  1. A1,1-dibromoethane
  2. B1,2-dibromoethane
  3. C1,2-dibromopropane
  4. D1,1,2-tribromoethane

Answer: B

The cluster shows two Br atoms. , which is , so the formula is (degree of unsaturation 0). has four equivalent hydrogens (one signal), whereas has two signals.
Practice Structural Identification and Practical Organic Chemistry More on Degree of unsaturation and spectroscopic clues
Previous questionNext question

More questions on Degree of unsaturation and spectroscopic clues