First slide

Alkenes

Question

In which of the following molecule all the carbon-carbon bonds are not equal.

Moderate

A

Ethane
B

Propane
C

Propdiene
D

Propene

Solution

[Step 1]:
In option 1) Ethane $H_{3} C - {CH}_{3}$ contain one C-C bond.
[Step 2]:
In option 2) Propane $H_{3} C - {CH}_{2} - {CH}_{3}$ all three carbons are SP3 and are equal.
[Step 3]:
In option 3) Propdiene $H_{2} C = C = {CH}_{2}$ all carbons are SP2 and are equal.
[Step 4]:
In option 4) Propene $H_{3} C - CH = {CH}_{2}$ one carbon is SP3 and other two carbons are SP². Therefore all carbons are not equal.

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