challenge 7,organic chemistry.Try it.

(B) ?? not sure

Yes it's B. Pleasse explain how u got to it.

yup
the answer is b

i have solved it as follows:

in the first rxn OH acts as base and in the second one

CH2=CH-PPH3BR WE CAN SHOW RESONANCE TO FORM BETWEEN POSITIVE CHARGE ON P AND DOUBLE BOND TO FORM YLIDE OR WITTIG REAGENT

THEN IT IS A SIMPLE WITTIG REACTION

WHN U WIIL MAKE RESONANCE OF GIVEN REAGENT THAN POSITIVE CHARGE WILL COME ON ONE CARBON AND IT WILL ATTACH TO O OF THE RING AND THAN INTAMOLECULAR WITTIG RXN WILL FORM THS PRODUCT