Question

how geometrical isomerism exist in alkenes​

Answer 1

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ᴄɪs- ᴀɴᴅ ᴛʀᴀɴs-ᴀʟᴋᴇɴᴇs.✔⚡

If alkenes have two different substituents at each end of the C=C then they can exist as stereoisomers (as geometric isomers). This is because there is restricted rotation of the double bond due to the pi bond which means they don't readily interconvert.

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Answer 2

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ᴄɪs- ᴀɴᴅ ᴛʀᴀɴs-ᴀʟᴋᴇɴᴇs.✔⚡

If alkenes have two different substituents at each end of the C=C then they can exist as stereoisomers (as geometric isomers). This is because there is restricted rotation of the double bond due to the pi bond which means they don't readily interconvert.