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Grignard reagents and organo lithium com...

Grignard reagents and organo lithium compounds on addition to dry ice separately , followed by hydrolysis gives

A

ketones and carboxylic acids respectively

B

carboxylic acids and ketones respectively

C

only carboxylic acids

D

only ketones

Text Solution

Verified by Experts

The correct Answer is:
B
Grignard reagents (RMgX) react with dryice followed by hydrolysis gives carboxylic acids.
`R-MgX + O=C=O to [R-overset(O)overset(||)C-OMgX] underset(-Mg(OH)X)overset(H^(+)//H_(2)O)to underset("Carboxylic acids")(R-overset(O)overset(||)C-OH)`
Organolithium compounds being more nucleophilic add to C=O of addition product (I) to give addition product(II) which upon subsequent hydrolysis gives a ketone.
`R-Li+O=C=O to [R-overset(O)overset(||)underset((I))C-OLi] overset(R-Li)to`
`[R-underset(R )underset(|)overset(" OLi")overset(|)C-OLi]overset(H^(+)//H_(2)O)to[R-underset(R )underset(|)overset(OH)overset(|)C-OHunderset(-H_(2)O)to]tounderset("ketone")(R-overset(O)overset(||)C-R)`
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