Answer:
See explanation
Explanation:
A <u>trans</u> alkene is more stable than a <u>cis alkene</u> because they have fewer steric interactions.
<em>⇒ In a cis alkene there is steric hindrance, because the methyl groups are on the same side of the double bond. </em>
<em>Because of this steric crowding, there are van der Waals repulsive forces between the electron clouds of the groups.
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<em>This decreases the stability of the cis alkene.</em>
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In an elimination reaction, a geometry where the β hydrogen and the leaving group are on opposite sides of the molecule is called <u>anti</u> periplanar.
<em> ⇒ 'Anti’ refers to the two functional groups lying on opposite sides of the plane of the bond</em>
In an <u>SN1 </u>mechanism, a nucleophile attacks the carbocation, forming a substitution product,
<em> ⇒ The SN1 reaction is a substitution reaction, and means "nucleophilic substitution".The "1" says that the rate-determining step is unimolecular. Thus, the rate equation is often shown as having first-order dependence on electrophile and zero-order dependence on nucleophile.</em>
while in an <u>E1</u><u> </u>mechanism, a base removes a β hydrogen from the carbocation, forming a new π-bond.
<em> ⇒ E1 indicates a elimination, unimolecular reaction</em>
<em>This implies that the rate determining step of the mechanism depends on the decomposition of a single molecular species.</em>
<em>.This is a classic elimination reaction – forming a new C–C(π) bond, and breaking a C–H and C–leaving group bond.</em>
CH3CH2Br and NaOH react by an <u>SN2</u><u> </u>mechanism.
<em> ⇒ It's a type of reaction mechanism that is common in organic chemistry, where one bond is broken and one bond is formed, synchronously, (in one step.) </em>
Stronger bases, like hydroxide, favor<u> E2</u> reactions, whereas weaker bases, like water favor, <u>E1</u> reactions
Disubstituted alkenes always have the possibility to exist as two different <u>Diastereomer.</u>
<em>Diastereomer are stereoisomers that are not mirror images of one another and are non-superimposable on one another. They exist (always) in 2 forms.</em>
<u>Elimination reactions</u> are regioselective, favoring formation of the more substituted and more stable alkene.
