Alprenolol is a non-selective beta blocker used in the treatment of angina pectoris. It has the systematic name (R)-1-(2-allylphenoxy)-3-(isopropyl amino)-propan-2-ol. Draw the structure of alprenolol.

alprenolol is a secondary alcohol 2- propanol and is substituted at  position 3 by isopropylamino group and at position 1 by 2-allylphenoxy group.

It is beta adrenergic ant-agonist which is sympatholytic agent means anti-hypertensive, anti-anginal drug (decreases heart rate and blood pressure)

Explanation:

Below is the 2 dimension structure of alprenolol compound.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms