Stereochemistry and Polarimetry Say true or false. The specific rotation of a co

Question

Stereochemistry and Polarimetry

Say true or false. The specific rotation of a compound is independent of any other parameters. Is this statement true or false? The concentration of a liquid sample is substituted for by density, in general. Is this statement true or false? A solution of an unknown compound (3.0 g of the compound in 20.0 mL of solution), when placed in a polarimeter tube 2.0 dm long, was found to rotate the plane of polarized light 1.8_o in the counter clockwise direction. What is the specific rotation of the compound? The correct units for specific rotation are deg cm2 g-1, although the unit is usually just given as degrees. Can you show how the unit of specific rotation is deg cm2 g-1? A carbon atom is said to be stereogenic if it is bonded to four different groups. Identify the stereogenic carbons in the following compound. Mark the stereogenic carbon(s) with*.

Explanation / Answer

Q1.a

Yes, it is independent of any other parameters... only depends on the light used and temperature of experiment

Q2b

Typically, if we perform this in a polimter, this will be true for that specie (only in this experiments)

Q3

[A] = [A]obs / (l*c)

l = length of tube

C = concentration

so

C = 3/20 = 0.15

[A] = (1.8) / (2* (0.15)) = 6

Q3

From

[a] = deg / (L*C)

units of L = dm or cm, for concentration -- > g/cm3

then cm3 and cm cancel to form cm2

then

[A] =deg /(cm2*g)

Q4

NO compound added...

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