How many geometrical isomers does nona-2,4,6-triene, CH3-CH=CH-CH=CH-CH=CH-CH2CH3, have?

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JEE Main levelSingle correct optionDifficulty 2 of 3st016

How many geometrical isomers does nona-2,4,6-triene, $CH X_{3} - CH = CH - CH = CH - CH = CH - CH X_{2} CH X_{3}$ , have?

Answer: D

Each of the three

C = C

bonds has two different groups on both carbons, so each is stereogenic. The molecule has no symmetry (methyl at one end, ethyl at the other), so no combinations coincide:

2^{3} = 8

. A count of

6

would apply only to the symmetrical octa-2,4,6-triene.

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How many geometrical isomers does nona-2,4,6-triene, CHX3​−CH=CH−CH=CH−CH=CH−CHX2​CHX3​, have?

Answer: D

More questions on Geometrical isomerism and E/Z nomenclature

How many geometrical isomers does nona-2,4,6-triene, $CH X_{3} - CH = CH - CH = CH - CH = CH - CH X_{2} CH X_{3}$ , have?