Study the following statement with reference to drugs and choose the incorrect ones
(i). Barbiturates cause sleeplessness
(ii). Opioids are obtained from the leaves of Erythroxylum coca
(iii). Morphine is a very effective sedative and pain killer
(iv). Cocaine is obtained from hemp plant

Options

A. (i),(ii),(iii)
B. (ii),(iii),(iv)
C. (i),(iii),(iv)
D. (i),(ii),(iv)

Answer

To solve the question regarding the incorrect statements about drugs, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i): Barbiturates cause sleeplessness.**
- Barbiturates are classified as sedative-hypnotics, which means they are used to induce sleep. Therefore, this statement is incorrect because barbiturates do not cause sleeplessness; they actually promote sleep.

2. **Statement (ii): Opioids are obtained from the leaves of Erythroxylum coca.**
- Opioids are derived from opium, which comes from the poppy plant (Papaver somniferum). Erythroxylum coca is the source of cocaine, not opioids. Hence, this statement is also incorrect.

3. **Statement (iii): Morphine is a very effective sedative and pain killer.**
- Morphine is indeed a natural opioid that is known for its effectiveness as a sedative and painkiller. It is used in medical settings for pain management. Therefore, this statement is correct.

4. **Statement (iv): Cocaine is obtained from the hemp plant.**
- Cocaine is derived from the leaves of the Erythroxylum coca plant, not from the hemp plant (which is Cannabis sativa). Thus, this statement is incorrect.

### Conclusion:
The incorrect statements are:
- (i) Barbiturates cause sleeplessness.
- (ii) Opioids are obtained from the leaves of Erythroxylum coca.
- (iv) Cocaine is obtained from the hemp plant.

Thus, the answer is that statements (i), (ii), and (iv) are incorrect.

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