Assertion Metal carbonyls can be called organometallics
Reason Metal carbonyls do contain metal carbon bond .

Options

A. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .
B. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .
C. If`(A)` is correct, but `( R )` is incorrect .
D. Both `(A)` and `(R ) ` are incorrect .

Explanation

To analyze the assertion and reason given in the question, we will break down the concepts of metal carbonyls and organometallic compounds step by step.

### Step 1: Understanding Metal Carbonyls
Metal carbonyls are coordination compounds where a metal is bonded to carbon monoxide (CO) ligands. For example, nickel carbonyl (Ni(CO)4) consists of nickel bonded to four carbon monoxide molecules.

**Hint:** Recall that metal carbonyls are characterized by the presence of CO ligands coordinated to a metal center.

### Step 2: Definition of Organometallic Compounds
Organometallic compounds are defined as compounds that contain at least one bond between a carbon atom of an organic group and a metal. This means that for a compound to be classified as organometallic, it must have a direct carbon-metal bond with an organic moiety.

**Hint:** Remember that organometallic compounds must include an organic group that is directly bonded to the metal.

### Step 3: Analyzing the Assertion
The assertion states that "Metal carbonyls can be called organometallics." Since metal carbonyls do not contain any organic groups bonded to the metal, this assertion is incorrect.

**Hint:** Consider whether metal carbonyls have any organic groups attached to the metal.

### Step 4: Analyzing the Reason
The reason states that "Metal carbonyls do contain metal carbon bonds." This statement is true because metal carbonyls do indeed have metal-carbon bonds, specifically between the metal and the carbon of the CO ligands.

**Hint:** Identify whether the presence of metal-carbon bonds alone qualifies a compound as organometallic.

### Step 5: Conclusion
Based on the analysis:
- The assertion is incorrect because metal carbonyls do not have organic groups and thus cannot be classified as organometallics.
- The reason is correct in stating that metal carbonyls contain metal-carbon bonds.

Therefore, the correct answer is that the assertion is false, while the reason is true.

**Final Answer:** Assertion is false; Reason is true.