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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3st262

The compound shown is 2-chloro-3-fluorobut-2-ene drawn with a definite geometry. Which of the following statements are correct?

  1. AThe compound shown is the isomer
  2. BOn C2 chlorine outranks methyl and on C3 fluorine outranks methyl
  3. CIn the compound shown the two methyl groups are on the same side of the double bond
  4. DThe other geometrical isomer of this compound is chiral

Answer: A, B, C

Halogens outrank carbon, so is the higher group on C2 and the higher group on C3. In the drawing and are on the same side of the double bond, so the configuration is , and consequently the two methyls are also on the same side. Both geometrical isomers are planar molecules with the molecular plane as a mirror plane, so neither is chiral.
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