Stereochemistry in biological molecules is often denoted by the D- and L- conven

Question

Stereochemistry in biological molecules is often denoted by the D- and L- convention, instead of the R- and S- configurations determined by the Cahn-Ingold-Prelog methodology. Historically, the glyceraldehyde enantiomer that rotated plane polarized light clockwise was arbitrarily designated as "D" and the other enantiomer was designated as the "L" configuration. The D-glyceraldehyde Fischer projection is shown below. Identify which of the following structures are equivalent to the D-configuration. D - glyceraldehyde

Explanation / Answer

since in the molecules A,C & E we have the hygrogen coming out of the plane forming a wedge so the actual direction of rotation of the molecules would be opposite to that determined by the preference order of the atoms or functional group. so the only molecule A, C & E would structures equivalent to that of D-configuration.

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