NEET Chemistry Hydrogen Questions Solved


In the preparation of hydrogenated oil the chemical reaction involving hydrogen is called:

(a) hydrogenation

(b) reduction

(c) dehydration

(d) oxidation

(a)

  1. Necessity for Hydrogenation • Hydrogenated fat is basically a substitute to butter fats. • High costs of butter fat and its poor storage stability were detrimental factors that led to the investigation of alternative sources of hard fats. • This investigation led to the invention of catalyzed H2 addition across unsaturated sites of oils and fats and was quickly commercialized. • Conversion of liquid oils to solid and semi-solid fats having wide spectrum of physical & chemical characteristics of products were thus obtained.
  2.  What is Hydrogenation? • Hydrogenation is a process that reduces unsaturated fatty acid content of triglycerides by attaching hydrogen atoms at the point of unsaturation in the presence of catalyst, usually Nickel. • Hydrogenation accomplishes two things-: • 1.It increases the melting point of the oil or fat. • 2.Resistance to oxidation and flavor deterioration. • Hydrogenation process depends on several parameters: • Pressure, Temperature, Type of catalyst, Speed of agitation etc.
  3.  MECHANISM • The mechanism involved in fat hydrogenation is believed to be the reaction between unsaturated liquid oil and atomic hydrogen adsorbed on a metal catalyst. • It is similar to hydrogenation of alkenes.

Difficulty Level:

  • 80%
  • 10%
  • 7%
  • 4%
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