The formulas for ethane, ethene, and ethyne are  C2H6, C2H4, and C2H2, respectively.   Rank these compounds by the length of the carbon–carbon bond.   Longest C−C bond   to      Shortest  C−C bond   (answer bank:  C2H2,  C2H4,  C2H6)

Use the following table of bond energies to calculate the enthalpy of combustion (in kJ) of acetylene (C₂H₂) gas in oxygen, based on the following chemical equation: C₂H₂(g) + 2.5O₂(g) → 2CO₂(g) + H₂O(g)

We have thus far determined the single bond connectivity for (CH, ),CO as: H Н—с—с-—с—н H H There are six valence electrons still unaccounted. Carbon must form four bonds in order to satisfy the octet rule. Add a bond to carbon and fill in the remaining missing electrons. Select Draw Rings More H H. H H H

Two major resonance structures are possible for the anion shown. One resonance form is given, but it is incomplete. Complete the given structure by adding nonbonding electrons and formal charges. Draw the remaining structure, including nonbonding electrons and formal charges. Omit curved arrows. Structure A: complete the structure by adding nonbonding electrons and formal charges. H H H I Structure B: draw the remaining resonance structure, including nonbonding electrons and formal charges. H- : z: H H

Can you please do the last three rows of this table. The trichloroethane, ethane, and bromoethyne?

Select all the compound(s) from the following list that have at least one double bond. O NH3 O CO O CcI, O Sog O H20 O None of the compounds have double bonds

Pentane has several isomers. Which of the following condensed formulas is NOT an isomer of pentane? O CH3CH₂C (CH3)2 O CH2(C2H5)2 O CH3CH₂CH₂CH2CH3 O CH3C(CH3)3

A oxygen with one single bond and three lone pairs is a neutral oxygen an oxonium ion with formal charge -1 an oxyanion ion with formal charge -1 an oxyanion with formal charge +1 an oxonium ion with formal charge +1

Consider the compound C₂H₃N. Which one of the structures in Figure 4 is the best representation of this compound based on your current knowledge? *   A   B   C   D   All these structures are good representations of the compound.

Identify the class of organic compound (alcohol, carboxylic acid, halocarbon, alcohol, ketone, ester, ether).