One mole of alkene ' ' X on ozonolysis gave one mole each acetaldehyde and  acetone. The IUPAC of 'X' is

We need to find the structure of X.

Step 1: Recall ozonolysis

Ozonolysis cleaves the C=C bond and gives carbonyl compounds corresponding to the two sides of the double bond.

Step 2: Identify the fragments

Products: CH₃CHO → 2 carbons

CH₃COCH₃ → 3 carbons

So, the original alkene must have a total of 5 carbons, arranged such that cleavage gives these fragments.

Step 3: Match structure

CH₃CHO comes from a –CH=CH₃ fragment

CH₃COCH₃ comes from a –C(CH₃)=CH– fragment

Only 2-methyl-2-butene fits this pattern

Ozonolysis splits the C=C → gives acetone (CH₃COCH₃) and acetaldehyde (CH₃CHO)

Answer: c) 2-methyl-2-butene