The molecule shown below is called furan. It is represented intypical shorthand way for organic molecules, with hydrogenatoms not shown, and each of the 4 vertices representing acarbon atom. (a) What is the molecular formula for furan? (b) How manyvalence electrons are there in the molecule? (c) What isthe hybridization at each of the carbon atoms? (d) Howmany electrons are in the π system of the molecule? (e) TheC¬C¬C bond angles in furan are much smaller than thosein benzene. The likely reason is which of the following: (i) Thehybridization of the carbon atoms in furan is different fromthat in benzene, (ii) Furan does not have another resonancestructure equivalent to the one above, or (iii) The atoms in afive-membered ring are forced to adopt smaller angles than ina six-membered ring.

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The molecule shown below is called furan. It is represented in
typical shorthand way for organic molecules, with hydrogen
atoms not shown, and each of the 4 vertices representing a
carbon atom. (a) What is the molecular formula for furan? (b) How many
valence electrons are there in the molecule? (c) What is
the hybridization at each of the carbon atoms? (d) How
many electrons are in the π system of the molecule? (e) The
C¬C¬C bond angles in furan are much smaller than those
in benzene. The likely reason is which of the following: (i) The
hybridization of the carbon atoms in furan is different from
that in benzene, (ii) Furan does not have another resonance
structure equivalent to the one above, or (iii) The atoms in a
five-membered ring are forced to adopt smaller angles than in
a six-membered ring.

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