QQuestion
A hydrocarbon X undergoes the reaction under suitable conditions as shown below:
Which compound(s) is/are unsaturated?
(a) X only
(b) Y only
(c) X and Z
(d) Y and Z
ICSEClass 10ChemistryOrganic Chemistry01 Mark2026 Easy
✓Answer
(b) Y only
Explanation –
The reaction shown is cracking (thermal decomposition) of butane (X = C4H10), a saturated hydrocarbon, into propene (Y = C3H6) and methane (Z = CH4).
X (butane, C4H10) — saturated (only single bonds).
Y (propene, C3H6) — unsaturated (contains one C=C double bond).
Z (methane, CH4) — saturated (only single bonds).
Hence, only Y is unsaturated.
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