Conversion of an octal number 1368 to hexadecimal number is A. 7E16 B. 5E16 C. 5A16 D. 5D16 E. None of the above

The correct answer is $\boxed{\text{C) }5A_{16}}$.

To convert an octal number to hexadecimal, you can use the following table:

| Octal | Hexadecimal |
|—|—|
|

To convert 1368 to hexadecimal, we first divide it by 8, giving us 171 with a remainder of 4. We then divide 171 by 8, giving us 21 with a remainder of 5. We then divide 21 by 8, giving us 2 with a remainder of 7. Finally, we divide 2 by 8, giving us 0 with a remainder of 2.

The hexadecimal equivalent of 1368 is therefore $171_8 = 257_8 = 5A_{16}$.

Option A is incorrect because $7E_{16}$ is not equivalent to $1368_8$.

Option B is incorrect because $5E_{16}$ is not equivalent to $1368_8$.

Option C is correct because $5A_{16}$ is equivalent to $1368_8$.

Option D is incorrect because $5D_{16}$ is not equivalent to $1368_8$.

Option E is incorrect because there is a correct answer.