Draw the structure corresponding to (r)−2−chloropropanoic acid

The image of (r)−2−chloropropanoic acid is attached below.

(r)−2−chloropropanoic acid is a mono-basic acid. Further, as compared to propanoic acid it is a strong acid because of -I effect of -Cl atom.

Also, (r)−2−chloropropanoic acid is an optically active compound. It has one chiral centre. Since, the present compound is of r-form, hence it rotates plane polarized light to right. 

Image of (R)-2-chloropropanoic acid has been attached below

Explanation:

Here longest carbon chain contain 3 carbon atoms (prop means 3 carbon).

Functional group is -COOH (suffix oic acid means presence of -COOH group in longest carbon chain)

Numbering should start by assigning (1) to carbon in -COOH group

One stereocenter present at (2) position.

According to CIP rule of assigning preference to substituents in a stereocenter, Cl(a), -COOH (b), -Me(c) and H(d).

Cl should remain above the plane and H below the plane so that   gives clockwise rotation keeping (d) far apart from viewing side.

Iam not sure butch i thinnk it is ab

The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance.