Q3P - Organic Chemistry

Question

Draw the products formed when triacylglycerol A is treated with each reagent. Rank compounds A, B and C in order of increasing melting point.

1. ${\mathbf{H}}_2\mathbf{O}$,${\mathbf{H}}^{\mathbf{+}}$
2. data-custom-editor="chemistry" ${\mathbf{H}}_{\mathbf{2}}$(excess),data-custom-editor="chemistry" $\mathbf{Pd}\mathbf{-}\mathbf{C}\to \mathbf{B}$
3.   ${\mathbf{H}}_{\mathbf{2}}$(1 equiv),  $\mathbf{Pd}\mathbf{-}\mathbf{C}\to \mathbf{C}$

Step-by-Step Solution

Answer

a.

b.

c.

d.

Step 1: Triacylglycerol

Triacylglycerols comprise esters acquired from glycerol and three fatty acids. They form the primary part of body fat and vegetable fat. Unsaturated fats constitute a class of triglycerides and possess a low melting point.

Step 2: Melting point

The phase transformation from solid to liquid happens at a particular temperature termed the melting point. Pressure is one factor that impacts the melting point, and it is indicated at standard pressure.

Step 3: Treatment of triacylglycerol A with different reagents

a. The treatment of compound A with ${\text{H}}_{\text{2}}\text{O}$ ,${\mathrm{H}}^{+}$  can be given as:

                                                   Treatment of compound A with ${\text{H}}_{\text{2}}\text{O}$ ,${\mathrm{H}}^{+}$

b. The product obtained on the treatment of compound A with ${\mathrm{H}}_2$ (excess) and Pd-C can be given as:

                                 Treatment of compound A with ${\mathrm{H}}_2$ (excess) and Pd-C

c.The product obtained on the treatment of compound A with ${\mathrm{H}}_2$ (1 equiv) and Pd-C can be given as:

                      Treatment of compound A with ${\mathrm{H}}_2$  (1 equiv) and Pd-C

The compound comprising more significant double bonds possesses a minor melting point. So compound A, comprising two double bonds, has the lowest melting point. Compound C will have an intermediate melting point, and compound B with zero double bonds has the highest melting point.

The compounds can be arranged in the order of increasing melting point as: