Question
Name the functional groups present in the following compounds:
- $CH_3CHO$
- $CH_3CH_2COOH$
- $CH_3COCH_3$
- $CH_3CH_2CH_2OH$
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| Type of energy | Problem |
| (1) Solar energy | (a) Rehabilitation of displaced people |
| (2) Hydroelectric energy | (b) Rainy season and darkness |
| (c) Limited reserves | |
| (d) Disposal of wastes |
