What is meant by functional group in carbon compounds? Write in tabular form the structural formula and the functional group present in the following compounds:
(a) Ethanol
(b) Ethanoic acid
Functional Group: A functional group in carbon compounds is a group of atoms that is responsible for the characteristic reactions of the compound. It defines the reactivity and properties of the compound.
Table of Structural Formula and Functional Groups:
Arrange the following set of carbocations in order of decreasing stability.

Choose the correct answer from the options given below:
| Class | 0 – 15 | 15 – 30 | 30 – 45 | 45 – 60 | 60 – 75 | 75 – 90 |
|---|---|---|---|---|---|---|
| Frequency | 11 | 8 | 15 | 7 | 10 | 9 |
Leaves of the sensitive plant move very quickly in response to ‘touch’. How is this stimulus of touch communicated and explain how the movement takes place?