One of the most important uses for Grignard reagents is their addition to carbonyl compounds to give new carbon-carbon bonds. a. True
b. Flase

The correct answer is - True.

Explanation:

Grignard reagents used in addition to carbonyl compounds to give new carbon to carbon bonds. In order to the addition of carbon bonds of the organometallic compound acts as a nucleophile to add to the positive carbon of the carbonyl forming an alkoxide ion intermediate.

Alkoxide ions form in first step reactions by the reaction of phenyl magnesium bromide. Aqueous acid is used in the second step to protonate the alkoxide ion and form the product alcohol, it is hydrolysis the product of the first step.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

4d^55s^1 ( third choice)