Because despite the name @list you're in fact assigning it a single element which is precisely the string "'Ashok Hello'", that is: without the external double quotes, but with the internal single ones. That is precisely the difference between q() and qw(): the former returns non interpolated strings, and when used with "'" (single quotes) as a delimiter "q" become redundant, while
the latter returns a list of (non interpolated) "words" 1, splitting on whitespace.
1 Notice the double quotes - I mean that they're not required to match /^\w+$/.
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