Explanation:

This question asks to identify the option where there is *no appropriate antonym* (विलोमता नहीं है). This means we are looking for a pair where the two words are either synonyms or unrelated, rather than opposites. Let's analyze each option: Option (1): "अद्वितीय – द्वितीय (Adwitiya - Dwitiya)". * 'अद्वितीय' (Adwitiya) means 'unique', 'unparalleled', 'matchless', literally 'without a second'. * 'द्वितीय' (Dwitiya) means 'second'. These two words are not antonyms. While 'अद्वितीय' implies 'not second' in a qualitative sense (uniqueness), 'द्वितीय' refers to the ordinal number 'second'. They are not opposites in meaning. For instance, the opposite of unique would be common or ordinary. So, this pair lacks appropriate antonymy. Option (2): "अन्यायी - न्यायी (Anyayi - Nyayi)". * 'अन्यायी' (Anyayi) means 'unjust', 'one who is unjust'. * 'न्यायी' (Nyayi) means 'just', 'one who is just'. These are clear and appropriate antonyms. 'अन्यायी' is formed by adding the negative prefix 'अन्' to 'न्यायी'. Therefore, this option shows appropriate antonymy. Option (3): "अभिज्ञ - भिज्ञ (Abhigya - Bhigya)". * 'अभिज्ञ' (Abhigya) means 'knowledgeable', 'expert', 'aware'. * 'भिज्ञ' (Bhigya) also means 'knowledgeable', 'expert', 'aware'. These two words are synonyms, meaning they have very similar or identical meanings. They are certainly not antonyms. The correct antonym for 'अभिज्ञ' is 'अनभिज्ञ' (anabhigya - ignorant, unaware). Since 'अभिज्ञ' and 'भिज्ञ' are synonyms, this pair clearly demonstrates a lack of appropriate antonymy. This is a very strong candidate for the answer. Option (4): "अनिवार्य – निवार्य (Anivary - Nivarya)". * 'अनिवार्य' (Anivary) means 'compulsory', 'essential', 'unavoidable'. * 'निवार्य' (Nivarya) means 'avoidable', 'preventable'. These are appropriate antonyms. 'अनिवार्य' implies something that cannot be avoided, while 'निवार्य' implies something that can be avoided. Therefore, this option shows appropriate antonymy. **Conclusion:** Both Option (1) and Option (3) present pairs that are not appropriate antonyms. However, 'अभिज्ञ' and 'भिज्ञ' are direct synonyms, which is a more definitive lack of antonymy than 'अद्वितीय' and 'द्वितीय' which are simply unrelated in an antonymous sense. In such questions, a pair of synonyms presented as antonyms is usually the intended answer for 'no appropriate antonym'. Therefore, Option (3) is the most suitable answer.