[lovekblue]

See attached picture.
The answer is B. Please draw out the mechanism of it. There should be ring flip since the Cl is in the equatorial position but nucleophile can only attack when the leaving group is in the axial position? Tho when I try it out with ring flips and nucleophile attack and causes a inversion (SN2), I got back an axial group while the answer is in the equatorial.
Please help, thanks

[lovekblue]

Also have a second question.

Why is D considered as non conjugated while E is conjugated?
Thanks again.

[zsinger]

E is exactly one position away from another double bond-therefore contributing resonance.  The other position is not quite so close to a DB-->therefore, no resonance .    I think