From the pairs Hard:Soft, Hot:Cold, Right:Wrong and Come:Arrive, identify the odd pair based on antonym and synonym relationships.

Introduction / Context:
This is a verbal reasoning question involving relationships between words. Each option contains a pair of words, and you are asked to find the pair that does not belong with the others. Three pairs are made of opposites, that is antonyms, while one pair consists of words with similar meanings, that is synonyms. Recognizing these relationships is an important part of vocabulary based aptitude questions.

Given Data / Assumptions:
The given pairs are Hard:Soft, Hot:Cold, Right:Wrong and Come:Arrive. We assume standard dictionary meanings of these English words. We identify whether each pair is made up of antonyms or synonyms. We then select the pair that has a different type of relationship from the others.

Concept / Approach:
The key concept is the distinction between antonyms and synonyms. Antonyms are words with opposite meanings, such as hot and cold. Synonyms are words with similar meanings, such as arrive and come. In this set, three pairs clearly express opposite qualities, while one pair expresses roughly the same idea. The synonym pair therefore becomes the odd one out. Focusing on meaning rather than word form is crucial to solve this quickly.

Step-by-Step Solution:
Step 1: Hard and Soft are opposites in terms of physical texture or firmness. Something can be hard like stone or soft like cotton. Step 2: Hot and Cold are direct opposites in terms of temperature. If water is hot, it is not cold, and if it is cold, it is not hot. Step 3: Right and Wrong are opposite concepts related to correctness or morality. A correct answer is right, and an incorrect one is wrong. Step 4: Come and Arrive both describe movement toward a place. Arrive is often used when you reach a destination, while come also expresses movement toward the speaker or a point. They therefore have very similar meanings. Step 5: The first three pairs clearly consist of antonyms, and the last pair consists of near synonyms. Step 6: Hence, Come:Arrive is the pair whose relationship differs from the others and is the odd one out.

Verification / Alternative check:
As a quick check, replace each pair with the phrase opposite of. Hard is the opposite of soft, hot is the opposite of cold and right is the opposite of wrong, and all of these statements are true. If you try the same with come and arrive, saying come is the opposite of arrive, the statement is clearly false, which confirms that they are not antonyms. You can also see that in many sentences, come and arrive could be used in similar contexts, supporting their synonym like relationship.

Why Other Options Are Wrong:
Hard:Soft is not the odd pair because the words are clear antonyms. Hot:Cold is not the odd pair because these words are also direct opposites. Right:Wrong is not the odd pair because they represent opposite ideas about correctness. Come:Arrive is the odd pair because these words share a similar meaning instead of being opposites.

Common Pitfalls:
One common mistake is to note that come and arrive differ slightly in usage and therefore treat them as unrelated, missing their broadly similar meaning. Another pitfall is to focus on grammatical similarity, since all words are verbs or adjectives, and ignore the key difference in semantic relationship. To handle such questions, always ask whether the words in each pair pull in opposite directions or point to nearly the same idea.

Final Answer:
The pair that is not an antonym pair and is therefore the odd one out is Come:Arrive.