🎺MCAT Full Prep All Topics

5B: Molecules & Interactions

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Question

For a molecule with n stereocenters, what is the maximum number of stereoisomers?

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Answer

Up to 2n.

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Question

London dispersion

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Answer

Universal IMF from instantaneous-induced dipoles; clue: weakest and increases with size/mass.

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Question

Why can't a C−H bond serve as a hydrogen-bond donor?

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Answer

Carbon is not electronegative enough.

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Question

Dimethyl ether vs. ethanol: why can one hydrogen-bond to itself but the other cannot?

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Answer

Ethanol has an O−H donor; dimethyl ether has O but no O−H.

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