Which of the following reactions would give caproic acid ?

Options

A. `n-C_5 H_11 Br overset ((i) Mg//ether) underset((ii) CO_2) rarr`
B. `n-C_5 H_11 Li overset ((i) CO_2) underset((ii) H_3 O) rarr`
C. `n-C_(4)H_(9)Br underset({:((i)CO_(2)),((iii)H_(3)O^(o+)):})overset((i)Mg//"ether")(to)`
D. `n-C_5 H_11 MgBr + (CN)_2 overset((i) Delta) underset((ii) H_3 O^(oplus))rarr`

Answer

A, B

Explanation

(a,b) The `IUPAC` name of caproic acid is hexanoic acid `(6-C-atom acid)`. So, `G.R` must contain `5`-X-atom alkyl group.
(a) `n-C_5H_11 Br overset (Me//ether)rarr n-C_5H_11 Br`
`overset ((i)CO_2) underset((ii) H_3 O^(oplus))rarr n-C_5 H_11 -COOH`.
(b) `n-C_5H_11 Li overset ((i) CO_2) underset ((i)H_3 O^(oplus))rarr` .
( c) Gives pentanoic acid.
`n-C_5 H_11 Mg Br + (CN)_2 overset((i) Delta)rarr`
.