CH₃-CH₂-CH₂-OH →(H₂SO₄) 'X' + H₂O; here compound 'X' is:

Think it through first, then pick an option.

Answer and explanation

Correct answer: d C₃H₆

C₃H₈O minus H₂O is C₃H₆ (propene), just as ethanol gives ethene.

Why the other options are wrong

a C₃H₈: Concentrated H₂SO₄ removes water, it does not add H₂; propanol gives the alkene C₃H₆, not C₃H₈.
b C₃H₆O: C₃H₆O still holds oxygen; removing water takes the oxygen away, leaving C₃H₆.
c C₃H₄: C₃H₄ is propyne; losing one water molecule gives propene, C₃H₆.