Arrange the following English words in the same sequence in which they would appear in a standard English dictionary, and then select the correct sequence code from the options given below: 1. Xenons 2. Xylyls 3. Xanthic 4. Xenians 5. Xyst.

Introduction / Context:
This question tests your understanding of dictionary or alphabetical order for words. In many reasoning exams, you are asked to arrange words exactly as they would appear in a dictionary and then choose the corresponding numerical code. Being comfortable with such ordering helps in solving coding, classification, and arrangement questions quickly and accurately.

Given Data / Assumptions:

• We have five words: Xenons, Xylyls, Xanthic, Xenians, and Xyst.
• The code 1, 2, 3, 4, 5 corresponds to Xenons, Xylyls, Xanthic, Xenians, and Xyst respectively.
• We must arrange the words in dictionary order and then express that order as a sequence of numbers.
• Standard English alphabetical order is used, comparing letter by letter from left to right.

Concept / Approach:
Dictionary order means that words are arranged based on their letters from left to right. When comparing two words, you compare the first letters. If they are equal, compare the second letters, and so on, until a difference is found. The word with the earlier letter at the first differing position comes first. If one word is a prefix of another, the shorter word comes first.

Step-by-Step Solution:
Step 1: Write the words with their serial numbers: 1. Xenons, 2. Xylyls, 3. Xanthic, 4. Xenians, 5. Xyst. Step 2: Compare the first letters. All words start with X, so we move to the second letter. Step 3: Note the second letters: Xanthic has a, Xenons has e, Xenians has e, Xylyls has y, Xyst has y. In the alphabet, a comes before e, which comes before y. So Xanthic (3) is definitely the first word. Step 4: Now compare the words starting with Xe: Xenons (1) and Xenians (4). After X e n, we have i in Xenians (X e n i a n s) and o in Xenons (X e n o n s). Since i comes before o, Xenians (4) comes before Xenons (1). Step 5: Now compare the words that start with Xy: Xylyls (2) and Xyst (5). After X y, the third letters are l in Xylyls and s in Xyst. Since l comes before s, Xylyls (2) comes before Xyst (5). Step 6: Combine the order we have found: Xanthic (3), Xenians (4), Xenons (1), Xylyls (2), and Xyst (5). So the correct sequence is 3 4 1 2 5.

Verification / Alternative check:
A quick verification method is to group words by their second letters: X a ... (Xanthic), X e ... (Xenons, Xenians), and X y ... (Xylyls, Xyst). Within each group, alphabetically compare subsequent letters. Doing that again confirms the order Xanthic, Xenians, Xenons, Xylyls, Xyst and hence the code 34125.

Why Other Options Are Wrong:
Option 34521 places Xanthic first and Xenians second, but then orders Xenons, Xyst, and Xylyls incorrectly. Option 43251 starts with Xenians and Xenons and does not place Xanthic first, which violates dictionary order because a is earlier than e. Option 51342 starts with Xyst, although any word beginning with Xa must come before Xy groups. Option 35421 also misorders the Xe and Xy groups and does not match the properly derived sequence.

Common Pitfalls:
Candidates sometimes look only at first or second letters and forget to compare further letters. Unfamiliar words like Xanthic and Xylyls may also distract from the mechanical alphabetical procedure. A consistent letter by letter comparison avoids confusion, regardless of the meaning of the words.

Final Answer:
The correct dictionary order is Xanthic, Xenians, Xenons, Xylyls, and Xyst, which corresponds to the code 34125.