Question

Grignard reagent adds to
A.

B.

C.

D. All of the above

Answer 1

Hint: Grignard reagent is a chemical compound formed by reaction of haloalkane to magnesium present in a flask containing diethyl ether. Diethyl ether act as solvent in the reaction.

Complete Step by Step Solution:
The general formula of Grignard reagent is RMgX where X denotes the halide group and R denotes the alkyl group.

A. The reaction taking place between Grignard reagent and the ketone containing compound is shown below.

Image: Reaction of Grignard reagent with ketone
When a ketone containing compound is reacted with Grignard reagent it forms a complex which on hydrolysis forms alcohol.
Alcohol is a compound where a carbon atom is bonded to a hydroxyl group. The hydroxyl group or alcohol is represented by \[R - OH\].

B. The reaction taking place between the Grignard reagent and nitrile-containing compound is shown below.

Image: Reaction of the Grignard reagent with nitrile.
When a nitrile-containing compound is reacted with Grignard reagent it forms a complex which on hydrolysis gives ketone.
Ketone is a compound where a carbon atom is bonded to one oxygen atom by a double bond and two alkyl groups by a single bond. The general formula of ketone is R-CO-R.

C. The reaction taking place between Grignard reagent and a compound containing \[ - C = S\] is shown below.

Image: Reaction of Grignard reagent with \[ - C = S\]
When a compound containing \[ - C = S\]is reacted with Grignard reagent it first forms a complex which on hydrolysis gives the thiol compound.
A thiol is a functional group where sulphur is bonded to hydrogen and an alkyl group by a single bond. The general formula of thiol is R-SH.
Therefore, the correct option is D.

Note: A Grignard reagent act as a very strong nucleophile and act like carbonyl compounds with an electrophile.