Choose the statements that accurately describe the Wittig reaction.

STRATEGY: Review the characteristics of the Wittig reaction. Consider the types of reactants involved, the type of transformation that occurs, and the types of products that result.

A. the product is an ylide
B. involves a ylide as a reactant/intermediate
C. results in a betaine intermediate
D. a ketone is a required reactant
E. a C=C bond becomes saturated

B. Involves a ylide as a reactant/intermediate  

C. Results in a betaine intermediate

Explanation:

The Wittig reaction is the reaction of an aldehyde or ketone with a triphenylphosphonium ylide to form an alkene.

A betaine intermediate is the precursor to an oxaphosphetane intermediate.

A. is wrong. The ylide is a reactant/intermediate.

D. is wrong. The reactant can be an aldehyde

E. is wrong. A C=O bond becomes a C=C bond.

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explanation:

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.