Given below are two statements: 

Assertion (A): Linkage isomerism arises in coordination compounds containing ambidentate ligand.
Reason (R): Ambidentate ligand has two different donor atoms.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Hint: Linkage isomerism is because of ambidentate ligand

Linkage isomerism arises in coordination compounds containing ambidentate ligands because ambidentate ligand has two different donor atoms. e.g., SCN, NO2 etc.

The example of linkage isomerism is as follows:

[(NH3)5Co-SCN]2+ and [(NH3)5Co-NCS]2+

Hence, option 1 is the answer.