Endosperm vs cotyledon

[mgdent]

1. Food storing tissue in the developing plant embryo is called?- endosperm. What if cotyledon was given as an answer choice too (or would they not do that?) I was under the impression that the cotyledon stores the food and contributes to di/mono features while the endosperm is more involved in feeding the embryo?

2. What is the E2 product for
Br
CH3CH2-C-CH3
CH3-C-CH2CH3
H

Answer-
CH3---C---CH2CH3
(C=C double bond)
CH3---C----CH2CH3

What I am confused about is why this is more stable then

CH2CH3---C---CCH3
(C=C double bond)
CH3---C----CH2CH3 ???

This is what I selected because the 2 ethyl groups were trans but apparently the answer has them on the same side because E2 results in an antiperiplanar configuration. This causes it to rotate around. Can anyone explain?

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[mgdent]

anyone have any ideas?

 

[DQLEUCD]

1. Food storing tissue in the developing plant embryo is called?- endosperm. What if cotyledon was given as an answer choice too (or would they not do that?) I was under the impression that the cotyledon stores the food and contributes to di/mono features while the endosperm is more involved in feeding the embryo?

2. What is the E2 product for
Br
CH3CH2-C-CH3
CH3-C-CH2CH3
H

Answer-
CH3---C---CH2CH3
(C=C double bond)
CH3---C----CH2CH3

What I am confused about is why this is more stable then

CH2CH3---C---CCH3
(C=C double bond)
CH3---C----CH2CH3 ???

This is what I selected because the 2 ethyl groups were trans but apparently the answer has them on the same side because E2 results in an antiperiplanar configuration. This causes it to rotate around. Can anyone explain?

E2 can undergo only if there is a carbon with a hydrogen in the anticoplaner position meaning that if the Br is Wedge, the hydrogen must be Dash. It does not matter if it's in an unfavorable position, it just needs a hydrogen in the anticoplaner position. If there are multiple anticoplaner hydrogens, you can then see which is most stable via Markovnikoff's rule.