Design a synthesis of 1-cyano-2-methylbicyclo[2.2.1]-2,5- heptadiene from cyclopentene and any other compounds using a diels-alder cycloaddition reaction. part 1 out of 9 choose the best option for the dienophile precursor to the target molecule.

Where is the graph ?

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.