How many of the following are biodegradable co-polymers ?
Nylon-2, Nylon-6, PHBV, PGA, PLA, melamine

Answer

2

Explanation

PHBV - Poly `beta`-hydroxy butyrate-co-`beta`-hydroxy valerate
`[-O-underset(CH_(3))underset(|)(CH)-CH_(2)-underset(O)underset(||)(C)-O-underset(C_(2)H_(5))underset(|)(CH)-CH_(2)-underset(O)underset(||)(C)-]_(n)`
Nylon-2 Nylon - 6 `[-NH-CH_(2)-overset(O)overset(||)(C)-NH-(CH_(2))_(5)-CO-]_(n)`