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Q. Which heteroatom present in pyrrole?

Q. What is the percent composition of a mixture of (S)-(+)-2-butanol,[!] D/25 = +13.52º, and (R)-(-)-2-butanol,[!] D/25 = -13.52º, with a specific rotation [!] D/25 = +6.76º?

Q. Amiodarone, antiarrhythmic agent, possess_________ heterocyclic ring.

Q. Enantiomers are:

Q. Which of the following molecules is achiral?

Q. Complete the reaction:

Q. Thiophene is reduced with Raney nickel (Ni) which results in removal of sulphur to form______.

Q. What is the relationship between the two groups in the following molecules?

Q. Which drug(s) contain thiophene ring in its(their) structure?

Q. Which of the following terms correctly describe(s) the structural relationship between cis-1,3- dimethylcyclopentane and trans-1,3-dimethylcyclopentane?