3. Which of the following is NOT true about Grignard reagents? They include a me
ID: 1031544 • Letter: 3
Question
3.
Which of the following is NOT true about Grignard reagents?
They include a metal directly bonded to a carbon.
They are organometallic compounds.
They consist of a highly polar bond.
They tend to be electrophiles.
They are useful for forming new carbon–carbon bonds.
4.
Which reactant (if any) is the Lewis base for the following reaction?
Choice A
Choice B
Choice C
None of the above
a.They include a metal directly bonded to a carbon.
b.They are organometallic compounds.
c.They consist of a highly polar bond.
d.They tend to be electrophiles.
e.They are useful for forming new carbon–carbon bonds.
4.
Which reactant (if any) is the Lewis base for the following reaction?
a.Choice A
b.Choice B
c.Choice C
d.None of the above
Explanation / Answer
3)Grignard reagents are alkyl/aryl magnesium halideshaving the general formula R-Mg X.
For eg. CH3Mg Br
a) True Carbon is bonded with Mg.
b) True. They are organo metallic compounds.
c) True. Mg is highly electro positive . Hence C-Br bond is highly polar. CH3 group acquires a partial - ve charge ang Mg a partial +ve charge
d) Not true. Due to the -ve charge on C of alkyl group they tend to be nucleophiles, and attack on carbonyl carbon which is electron deficient.
e) True. They react with formaldehyde gives primary alcohols, react with ketones to form tertiary alcohols.... with the formation of new C-C bonds.
4) Question is not in readable format.
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