UPSEE 2017 Solved Paper

Only compound 1-phenyl-2-butene can show geometrical isomerism.
(a) 3-phenyl-1-butene

4

CH3

−

3

CH |

ph

−

2

CH

=

1

CH2

(No geometrical isomerism)
(b) 2-phenyl-1-butene

4

H3

C−

2

CH2

−

2 C |

ph

=

1

CH2

(No geometrical isomerism)
(c) 1, 1, diphenyl-1-propene
(No geometrical isomerism)
(d) 1-phenyl-2-butene:

4

CH3

−

3

HC

=

2

CH

−

1

CH2

−ph
The correct possible answer is (d) but due printing mistake. No answer is correct.