Formalin consists of mixture of formaldehyde methyl alcohol and water Percentage of water in it is________________?
Correct answer: C. 52%
- A. 60%
- B. 50%
- C. 52%
- D. 8%
Explanation
Commercial formalin usually contains 40% formaldehyde and about 8% methanol, so water makes up the remainder: 100% - 40% - 8% = 52% water. The likely mistake is choosing 40%, which is the percentage of formaldehyde, not water.
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About Preparation of Aldehydes and Ketones
Aldehydes and ketones are prepared mainly by controlled oxidation or dehydrogenation of primary and secondary alcohols, respectively. The topic also includes ozonolysis of alkenes, hydration of alkynes and preparation through acyl derivatives, with attention to why primary alcohols can give aldehydes whereas secondary alcohols give ketones.
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