Stereochemistry Substitution Quiz

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Stereochemical basics test

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Chanchal Sharma

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Stereochemistry Substitution Quiz


Stereochemistry Substitution QuizVersión en línea Stereochemical basics test por Chanchal Sharma 1 What term describes molecules that rotate plane-polarized light to the right? a laevotatory (l-form) b +dextrorotatory (d-form) c racemates d achiral 2 What is a mirror-image pair of non-superimposable molecules called? a enantiomers b Isomers only c resonance d inversion 3 Which carbon center characterizes chirality when four different substituents attach to it? a achiral carbon b asymmetric carbon (stereocenter) c quaternary center d sp2 carbon 4 What term describes a mixture with equal enantiomer amounts that shows no optical rotation? a pure enantiomer b optically inactive c meso compound d racemic mixture 5 Which scientists argued that tetrahedral carbon allows non-superimposable mirror images? a Meyer and Wöhler b Van't Hoff and Le Bel c Kekule and Pauling d Pasteur and Le Bel 6 What is the sign used to denote a compound that rotates plane-polarized light to the left? a neutral (n) b negative (-) c positive (+) d zero (0) 7 What property do enantiomers share and differ in? a completely different properties b different boiling points only c no practical differences d identical physical properties except rotation 8 What is the process of converting an enantiomer into a racemic mixture called? a isomerisation b racemisation c resonance d Inductive effect 9 Which term refers to objects that are nonsuperimposable on their mirror images, like hands? a chirality b polarity c symmetry d anomerism 10 Which example is a chiral molecule from the text? a 2-bromopropanoic acid b butan-2-ol c ethane d benzene Feedback 1 Dextrorotatory molecules rotate light clockwise. 2 Enantiomers are non-superimposable mirror images. 3 An asymmetric carbon leads to chirality. 4 Racemic mixes cancel optical rotation. 5 Van't Hoff and Le Bel proposed the tetrahedral model. 6 Laevorotatory rotation is negative. 7 Enantiomers have identical phys. properties except optical rotation. 8 Racemisation yields equal enantiomers. 9 Chirality describes non-superimposable mirror images. 10 2-bromopropanoic acid is listed as chiral example.

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Stereochemistry Substitution Quiz

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Creada por

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Stereochemistry Substitution QuizVersión en línea

por Chanchal Sharma

What term describes molecules that rotate plane-polarized light to the right?

What is a mirror-image pair of non-superimposable molecules called?

Which carbon center characterizes chirality when four different substituents attach to it?

What term describes a mixture with equal enantiomer amounts that shows no optical rotation?

Which scientists argued that tetrahedral carbon allows non-superimposable mirror images?

What is the sign used to denote a compound that rotates plane-polarized light to the left?

What property do enantiomers share and differ in?

What is the process of converting an enantiomer into a racemic mixture called?

Which term refers to objects that are nonsuperimposable on their mirror images, like hands?

Which example is a chiral molecule from the text?

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