Give the name for the product from the hydrogenation of each of the following 3-methyl-2-pentene Spell out the full name of the compound. Submit Request Ans Part B Cyclohexen Spell out the full name of the compound. Submit Request Answer Part propene Spell out the full name of the compound Submit Request Answer
The Correct Answer and Explanation is:
Hydrogenation Products and Their Names:
Part A: 3-Methyl-2-pentene
Hydrogenation product: 3-Methylpentane
Part B: Cyclohexene
Hydrogenation product: Cyclohexane
Part C: Propene
Hydrogenation product: Propane
Explanation):
Hydrogenation is a chemical reaction in which hydrogen (H₂) is added across a carbon–carbon double bond (C=C) in the presence of a catalyst (commonly palladium, platinum, or nickel). This reaction converts alkenes (which contain double bonds) into alkanes (which contain only single bonds), making the molecule more saturated.
Part A: 3-Methyl-2-pentene → 3-Methylpentane
3-Methyl-2-pentene is a branched alkene with a double bond between carbon 2 and 3. During hydrogenation, this double bond is broken, and one hydrogen atom is added to each carbon of the former double bond. The resulting molecule, 3-methylpentane, is a saturated hydrocarbon (alkane) with no double bonds.
Part B: Cyclohexene → Cyclohexane
Cyclohexene is a six-membered ring with one double bond. Hydrogenation of cyclohexene adds hydrogen atoms across the double bond, converting it into a six-membered ring of all single bonds, which is cyclohexane. This is a common transformation in organic chemistry and is used industrially in the production of nylon intermediates.
Part C: Propene → Propane
Propene (also known as propylene) has three carbon atoms with one double bond between the first and second carbon atoms. Hydrogenation of propene adds hydrogen atoms to the double bond, yielding propane, a simple three-carbon alkane. This is a basic example used to illustrate hydrogenation reactions in alkenes.
Conclusion:
Hydrogenation is a vital reaction in organic chemistry for converting unsaturated compounds into saturated ones. It’s widely used in industries, including food processing (e.g., hydrogenation of vegetable oils), fuel production, and pharmaceuticals. Each hydrogenation product mentioned is the fully saturated version of the original compound, differing only by the elimination of the double bond and the addition of hydrogen atoms.
