Which one of the following pairs gives effervescence with aqueous

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 Multiple Choice QuestionsMultiple Choice Questions

621.

Which one of the following gives, on ozonolysis, both aldehydes and ketones?

  • Me2C = CHMe

  • Me2C = CMe2

  • MeCH2 - C(Me) = CMe2

  • MeCH(Me) - CH = CHMe


622.

Distillation of acetone with concentrated sulphuric acid gives

  • diacetone alcohol

  • mesityl oxide

  • mesitylene 

  • propene-2-ol


623.

RCH2CH2OH can be converted to RCH2CH2COOH by the following sequence of steps

  • PBr3, KCN , H3O+

  • PBr3, KCN, H2/P+

  • KCN, H3O+

  • HCN, PBr3, H3O+


624.

Formation of cyanohydrin from a ketone is an example of

  • electrophilic addition

  • nucleophilic substitution

  • nucleophilic addition

  • electrophilic substitution


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625.

Which one of the following pairs gives effervescence with aqueous NaHCO3?

I. CH3COCl

II. CH3COCH3

III. CH3COOCH3

IV. CH3COOCOCH3

  • I and III

  • I and IV

  • II and III

  • I and III


B.

I and IV

Due to strong negative inductive effect shown by -Cl and -OCOCH3 group, acid chloride and acid anhydride are highly reactive among acid derivatives. They react independently with water even in the absence of catalyst to give carboxylic acid.

CH3COCl NaHCO3 (aq) CH3COONa + CO2 + HCl

CH3COOCOCH3 NaHCO3 (aq.) 2CH3COONa + CO2


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626.

When calcium acetate is distilled, it will produce which of the following compound ?

  • CH3COOH

  • CH3CHO

  • CH3COCH3

  • All of these


627.

Which of the following converts carbonyl compounds into hydrocarbons ?

  • H2/ Pt

  • LiAlH4

  • K2Cr2O7 / H2SO4

  • Zn-Hg / HCl


628.

Acetonitriles on hydrolysis produce which of the following?

  • Amine

  • Acid

  • Amines

  • Carbonyl compounds


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629.

Saturated fatty acids are represented by which of the formula?

  • CnHnO2

  • CnH3nO2

  • CnH2n+1

  • CnH2nO2


630.

Acetic acid and P2O5 reacts to produce which of the following ?

  • Acetic anhydride

  • Acetaldehyde

  • Phosphoric acid

  • Acetone


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