While of the following compounds will exhibit geometrical (or cis-trans) isomerism? (i) `CH_(3)CH=CHCH_(2)CH_(3)` (ii) `C_(6)H_(5)CH=CHCH_(3)` (iii) `CH_(2)=C(CH_(3))_(2)` `(CH_(3))_(2)C=CH-C_(2)H_(5)` Strategy: Essential requirement for any alkene to exhibit geometrical isomerism is that each of the double bonded carbon atoms should be attached to two different atoms or groups of atoms: `m!=n and p!=r`. Notice that `m` and `p` may be same or different Similarly, `n and r` may be same or different.

While of the following compounds will exhibit geometrical (or cis-tran

1.	While of the following compounds will exhibit geometrical (or cis-trans) isomerism? (i) `CH_(3)CH=CHCH_(2)CH_(3)` (ii) `C_(6)H_(5)CH=CHCH_(3)` (iii) `CH_(2)=C(CH_(3))_(2)` `(CH_(3))_(2)C=CH-C_(2)H_(5)` Strategy: Essential requirement for any alkene to exhibit geometrical isomerism is that each of the double bonded carbon atoms should be attached to two different atoms or groups of atoms: `m!=n and p!=r`. Notice that `m` and `p` may be same or different Similarly, `n and r` may be same or different.
Answer» Structures (i) and (ii) will exhibit geometrical isomerism. Structures (iii) and (iv) fail to do so because two identical atosm and//or groups are attached to one of the doubly bonded carbon atoms.

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