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The compound containing coordinate bond is:
(A) O3
(B) SO3
(C) H2SO4
(D) All of these

Answer
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Hint: We know that when a pair of electrons are shared by two atoms, a covalent bond is formed. Now when both the electrons shared by the two atoms are of the same atom, the bond formed is a coordinate covalent bond.

Complete step-by-step answer:To determine which of the compounds contain a coordinate bond, we first need to see the Lewis dot structure of all the compounds.
- Ozone (O3): Each oxygen atom has 6 electrons in its outermost shell. Since the ozone molecule has 3 oxygen atoms, its Lewis dot structure is as follows:

Here, we can see that the central oxygen atom forms a double bond with one oxygen atom but donates two electrons to the other oxygen atom to form a coordinate bond.
Hence O3 contains a coordinate bond.
- Sulfur Trioxide (SO3): Each oxygen atom has 6 electrons in its outermost shell and each sulfur atom has 6 electrons in its outermost shell. Since each sulfur trioxide molecule has 3 oxygen atoms and 1 sulfur atom, its Lewis dot structure is as follows:

Here, we can see that the central sulfur atom forms double bonds with the oxygen atoms. It has an expanded octet.
Hence SO3 does not contain a coordinate bond.
- Sulfuric Acid (H2SO4): Each oxygen atom has 6 electrons in its outermost shell, each sulfur atom has 6 electrons in its outermost shell and each hydrogen atom has 1 electron in its outermost shell. Since each sulfuric acid molecule has 4 oxygen atoms, 1 sulfur atom, and 2 hydrogen atoms, its Lewis dot structure is as follows:

Here, we can see that the central sulfur atom forms a single bond with 2 oxygen atoms and a double bond with the other 2 oxygen atoms. It has an expanded octet
Hence H2SO4 does not contain a coordinate bond.

So, the correct answer is option (A) O3 contains a coordinate bond.

Note: This question is tricky as it is easy to assume the presence of coordinate bonds in SO3 and H2SO4 when one does not know about the phenomenon of expansion of octet.
A non-metal central atom which has empty d-orbitals in its outermost shell and is bonded to highly electronegative atoms may sometimes expand its octet to accommodate more than 8 electrons and form covalent bonds.