Question

Which of the following compounds contains a double bond? (2 points). Select one:. a. O2. b. H2O. c. Cl2. d. NCl3.

Answer 1

The correct answer to this question is letter "B. O2."

The first structure for O2 has a double bond. So this makes the question to have an answer of O2, which contains a double bond when you try to draw its structure.

Answer 2

Answer : Option A)
`O_(2)`

Explanation : From the given options;

A)
`O_(2)` is the molecule which forms double bonds with own atom and becomes stable. It covalently shares the two valence electrons in the valence shell and becomes an octet.

B)
`H_(2)O` the water molecule does not forms double bond between H atom and O atom as the valency of oxygen is two and hydrogen is one. So two atoms of H forms a single bond with one atom of O.

C)
`Cl_(2)` molecule shares a covalent bond with the other atom of Cl. This does not forms a double bond as only one electron is needed for Cl to attain the octet state.

D)
`NCl_(3)` The N atom has 3 electrons for donating, which is fulfilled by each of Cl atoms as they need only one electron to be an octet. It forms a single bond as there are no lone pairs left to form a double bond.

Hence, the correct answer is
`O_(2)` molecule.