Which of these compounds is chiral? I II III I and II I and II Sertraline (shown

Question

Which of these compounds is chiral? I II III I and II I and II Sertraline (shown below) is the active ingredient in the antidepressant Zoloft. Pure sertraline has a specific rotation (alpha) of +37.9 degree in methanol solution. What would the observed rotation alpha be for a mixture of 5.75 g of pure sertraline in 30.0 ml of methanol if the solution is placed in a 10.0 cm polarimeter cell? 72.6 degree 19.8 degree 7.26 degree 198 degree 0.726 degree Which of the following molecules is achiral and meso?

Explanation / Answer

2) The given compounds are called as allenes. In order for a molecule to be chiral, it should not have mirror plane symmetry i,e.- the mirror images should not be superimposable on each other. Thus out of the given allenes, only str II is chiral and the rest two are achiral, owing to the presence of mirror plane symmetry.

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