Question

The total number of head to tail isoprene linkages in the following molecule is .......... 

Hint:

In molecules with isoprene units, count the head-to-tail linkages by identifying how the units are connected in the molecular structure.

Answer 1

Correct Answer: 4

To determine the number of head-to-tail isoprene linkages in the given molecule, we first need to understand the structure of an isoprene unit, which is 2-methyl-1,3-butadiene. The "head" is the branched end (methyl group), and the "tail" is the end opposite the methyl group.

1. Identify Isoprene Units: Observe the repeating units consisting of carbon backbones with attached methyl branches.

2. Map Head-to-Tail Linkages:

• Consider each unit as an isoprene segment.
• Check for the connection points where the "tail" of one isoprene unit connects to the "head" of the next unit.

By examining the structure, it's evident that the linkages are as follows:

1. First unit to second unit
2. Second unit to third unit
3. Third unit to fourth unit
4. Fourth unit to fifth unit

3. Count Linkages: There are 4 head-to-tail linkages in total.

Thus, the total number of head-to-tail isoprene linkages in the molecule is 4.