Q.

A hydrocarbon ‘X’ with formula C6H8 uses two moles of H2 on catalytic hydrogenation of its one mole. On ozonolysis, ‘X’ yields two moles of methane dicarbaldehyde. The hydrocarbon ‘X’ is:                 [2023]

1 hexa-1, 3, 5-triene  
2 1-methylcyclopenta-1, 4-diene  
3 cyclohexa-1, 3-diene  
4 cyclohexa-1, 4-diene  

Ans.

(4)