Which one of the following pair is NOT correctly matched?

1. A

   Neoprene - Specialized

   Neoprene claims to be a specialized synthetic rubber used in various industrial applications. This statement is correctly matched as neoprene is indeed a polymer of chloroprene possessing good chemical stability.

2. B

   Aspartame - Synthetic sweetener

   Aspartame claims to be a synthetic sweetener commonly used as a sugar substitute in diet foods and beverages. This pairing is correct because aspartame is a methyl ester of a dipeptide used widely for sweetening.

3. C

   Oxytocin - Hormone

   Oxytocin claims to be a hormone produced by the hypothalamus and secreted by the pituitary gland. This is a correct match as it plays a vital role in social bonding, reproduction, and childbirth.

4. D

   Rayon - Midified starch

   Rayon claims to be a modified starch, which is the incorrect pairing that serves as the key for this question. Rayon is actually a regenerated cellulose fiber derived from natural sources like wood pulp rather than being a modified starch, making this the incorrect match among the given choices.

Summary. Official key is (d). Rayon claims to be a modified starch, which is the incorrect pairing that serves as the key for this question. Rayon is actually a regenerated cellulose fiber derived from natural sources like wood pulp rather than being a modified starch, making this the incorrect match among the given choices.