Statement B: All the transition metals form monometallic carbonyls.

Explanation:

Transition metals:
Transition metals are a group of elements in the periodic table that are located in the d-block. They have partially filled d-orbitals, which gives them unique properties such as variable oxidation states, the ability to form complexes, and the formation of colored compounds.

Monometallic carbonyls:
Carbonyls are compounds that contain a metal and one or more carbon monoxide (CO) ligands. Monometallic carbonyls specifically refer to carbonyl complexes where only one metal atom is present.

Explanation of the statement:
The statement "All the transition metals form monometallic carbonyls" is not correct. While many transition metals do form monometallic carbonyls, it is not true for all transition metals. Some transition metals, such as chromium and copper, do not form stable monometallic carbonyl compounds.

Examples:
1. Nickel forms Ni(CO)4:
Nickel is known to form a stable monometallic carbonyl compound called tetracarbonyl nickel, Ni(CO)4. In this compound, nickel is coordinated to four carbon monoxide ligands.

2. Carbonyls are formed by transition metals:
Transition metals have a strong affinity for carbon monoxide ligands due to their partially filled d-orbitals. This allows them to readily form complexes with carbon monoxide, resulting in the formation of carbonyls.

3. Transition metals form complexes:
Transition metals are known for their ability to form coordination complexes, which are compounds consisting of a central metal atom or ion surrounded by ligands. These ligands can be neutral molecules or ions that donate electron pairs to the metal. The coordination number of a complex refers to the number of ligands attached to the metal.

Conclusion:
The correct answer is option B: All the transition metals form monometallic carbonyls. This statement is not correct because not all transition metals form monometallic carbonyl compounds. Some transition metals, such as chromium and copper, do not form stable monometallic carbonyls.