Step 1: Understanding the Concept:
Sammed Shikharji (located in Jharkhand, India) is the most sacred pilgrimage site for Jains. It is known as the "Siddha Kshetra" because a significant number of the twenty-four Tirthankaras attained their final liberation from this mountain.
Step 2: Detailed Explanation:
1. Analysis of Assertion (A): While Sammed Shikhar is highly significant, it is a common misconception that all 24 Tirthankaras attained Moksha there. In reality, twenty out of the twenty-four Tirthankaras attained liberation from Sammed Shikhar. The four who attained it elsewhere are: Rishabhdev (Mount Kailash), Vasupujya (Champapuri), Neminath (Mount Girnar), and Mahavira (Pawapuri). Therefore, the word "all" (sarve) makes this assertion false.
2. Analysis of Reason (R): Lord Vimalnath is the 13th Tirthankara. He is indeed among the group of twenty Tirthankaras who attained Nirvana at Sammed Shikhar. Since he is a subset of the twenty, the statement in (R) is historically and traditionally true according to Jain scriptures.
3. Conclusion: The general statement (A) is incorrect due to specific exceptions, whereas the specific statement (R) is factually correct.
Step 3: Final Answer:
The assertion is false because of the 4 exceptions, but the reason is a true statement regarding Lord Vimalnath.