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Question

The number of geometrical isomers of CH3−CH=CH−CH=CH−CH=CH−CH3 is

A
4
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B
5
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C
6
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D
3
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Solution

The correct option is C 6
If the terminal group are same in polyene and the number of double bons is odd then, the number of geometrical isomer
=2n1+2n+121
=231+23+121
=22+21
=4+2
=6
They are : (1) cis, cis, cis
(2) trans, trans, trans
(3) cis, trans, trans
(4) cis, trans, cis
(5) trans, cis, trans
(6) cis, cis, trans

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