How many mono carboxylic acids are posible which on decarboxylation form iso-pentane?

Options

A. 6
B. 3
C. 5
D. 4

Answer

D

Explanation

`CH_(3)-overset(CH_(3))overset(|)(C)H-CH_(2)-CH_(2)-COOH`
`CH_(3)-overset(CH_(3))overset(|)(C)H-overset(COOH)overset(|)(C)H-CH_(3)`
`CH_(3)-underset(CH_(3))underset(|)overset(COOH)overset(|)(C)-CH_(2)-CH_(3)`
`HOOC-CH_(2)-underset(CH_(3)underset(|)(C)H-CH_(2)-CH_(3)`