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31. The reagent obtained by dissolving Copper sulphate in aqueous solution of citric acid and sodium carbonate is (NTSE Madhya Pradesh, Stage-I, 2014-15)
Bayer's reagent
Tollen's reagent
Fehling reagent
Benedict's reagent
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Comment
32. An organic compound is a clear liquid having a molecular formula C4H8O. It has an open chain structure without any carbon-carbon double bond. The compound can be (a) an alcohol (b) an ester (c) an aldehyde (d) a ketone (NTSE Stage-II,2013-14)
(a) & (b)
(c) & (d)
(b) & (d)
(d) & (a)
33. Esters are sweet-smelling substances. These when treated with NaOH then (i) Formation of alcohol and sodium salt (ii) Formation of carboxylic acid and water (iii) This reaction is known as saponification (NTSE Punjab, Stage-I, 2015-16)
(i) and (ii) are wrong
(ii) and (iii) are wrong
Only (ii) is wrong
Only (iii) is wrong
34. Artificial soap is (NTSE Uttar Pradesh, Stage-I, 2015-16)
Sodium stearate
Lauryl sulphuric acid
Lauryl alcohol
Sodium lauryl sulphate
35. IUPAC name of (NTSE Delhi, Stage-I, 2016-17)
Oxoethanal
Glyoxal
Ethanedial
Ethanedione
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