Step 1: Identifying the Incorrect Law-Year Match:
The task is to find the law incorrectly paired with its enactment year.
Step 2: Match Verification:
Maternity Benefit Act - 1961: This match is correct. This Act governs women's employment in specific establishments around childbirth, providing maternity benefits.
Trade Union Act - 1926: This match is correct. This Act concerns the registration and legal framework of Trade Unions.
Minimum Wages Act - 1948: This match is correct. This Act sets minimum wage standards for certain employment types.
Payment of Bonus Act - 1971: This match is incorrect. The Payment of Bonus Act, which provides for bonus payments in certain establishments, was enacted in 1965, not 1971.
Step 3: Conclusion:
The incorrect match is the Payment of Bonus Act- 1971.