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Question
Why but-2-ene is more stable than but-1-ene?
Why but-2-ene is more stable than but-1-ene?
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Solution
Alkenes having more alkylated double-bonded carbon are more stable due to the +R effect of an alkyl group.
In but-1-ene, there is only one alkyl group attached to the doubly bonded carbon atoms (CH2=CH−CH2−CH3), while in the case of but-2-ene there are two methyl groups attached to the carbon atoms of the double bond (CH3−CH=CH−CH3). So, it has more alkyl groups. Moreover, but-2-ene is a symmetrical molecule as compared to but-1-ene and therefore is more stable.
Alkenes having more alkylated double-bonded carbon are more stable due to the +R effect of an alkyl group.
In but-1-ene, there is only one alkyl group attached to the doubly bonded carbon atoms (CH2=CH−CH2−CH3), while in the case of but-2-ene there are two methyl groups attached to the carbon atoms of the double bond (CH3−CH=CH−CH3). So, it has more alkyl groups. Moreover, but-2-ene is a symmetrical molecule as compared to but-1-ene and therefore is more stable.
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