Question

Geometrical isomerism is possible in case of -
a) Pent-2-ene
b) Ethene
c) Butane
d) Hex-3-ene

• A. a,c
• B. b,c
• C. a,d
• D. a,b

Answer 1

The correct option is C a,d

Condition to show geometrical isomerism : $XYC=CXY$
X and Y must have different groups/atoms attached to carbon on the same side of double bond.
Among given compounds, only pent-2-ene and hex-2-ene can show geometrical isomerism.
Ethene have identical atoms on the same side of double bond; therefore, it cannot show geometrical isomerism.
Butane does not have double bond, thus it will not show geometrical isomerism.
Hence, the correct answer is option (c).