Methyl nitrite has the structure:
No attempt has been made here to indicate whether a bond is single or double or whether there is resonance. Obtain the Lewis formula (or formulas). The N─O bond lengths are 122 pm and 137 pm. Indicate the lengths of the N─O bonds in the compound.
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The structure of 1,3-butadiene is usually written as H2C=CHâCH=CH2. The average bond lengths given in Table 9.2 in your textbook are: CâC of 154 pm and C=C of 133 pm. Explain the fact that the observed value of the distance between the two central carbon atoms in 1,3-butadiene is 146 pm.
(a) Draw the best Lewis structure(s) for the nitrite ion, NO2-. (b) With what allotrope of oxygen is it isoelectronic? (c) What would you predict for the lengths of the bonds in NO2– relative to N – O single bonds and double bonds?
Mothballs are composed of naphthalene, C10H8, a molecule that consists of two six-membered rings of carbon fused along an edge, as shown in this incomplete Lewis structure:
(a) Draw all of the resonance structures of naphthalene. How many are there? (b) Do you expect the C – C bond lengths in the molecule to be similar to those of C – C single bonds,C = C double bonds, or intermediate between C – C single and C = C double bonds? (c) Not all of the C – C bond lengths in naphthalene are equivalent. Based on your resonance structures, how many C – C bonds in the molecule do you expect to be shorter than the others?