Question

question 1
how many signals would be present in the ¹hnmr?

Explanation:

Step1: Identify equivalent hydrogen - types

In $^1$H - NMR, equivalent hydrogen atoms give the same signal. Analyze the molecule's symmetry and connectivity.

Step2: Count hydrogen - types

The terminal methyl groups in the isopropyl part are equivalent, giving 1 signal. The methine hydrogen in isopropyl gives 1 signal. The two methylene groups on the left - hand side are different from each other and from the isopropyl hydrogens. So in total, there are 4 types of non - equivalent hydrogen atoms.

Answer:

A. 4