Practice Pakistan's most useful MCQs for competitive exams

Cannizaros reaction takes place through the transfer of ____________________ from complex anion?

• (A)  hydrogen ion
• (B)  hydride ion
• (C)  oxide ion
• (D)  methoxide ion

Answer

Submitted By :Ali Uppal

Dry distillation of calcium acetate results in the formation of_________________?

• (A)  formaldehyde
• (B)  acetaldehyde
• (C)  methane
• (D)  acetone

Answer

Submitted By :Ali Uppal

Tetrahydroborate ion is the source of_______________?

• (A)  proton
• (B)  H+
• (C)  both A & amp; B
• (D)  H-

Answer

Submitted By :Ali Uppal

Acetal on acid hydrolysis generates__________________?

• (A)  Alcohol
• (B)  Ketone
• (C)  Both A & B
• (D)  None of the above

Answer

Submitted By :Ali Uppal

Ncleophilic addition reactions are catalysed__________________?

• (A)  Acid
• (B)  Base
• (C)  Both A and B
• (D)  None

Answer

Submitted By :Ali Uppal

Oxidation of primary alcohol gives________________?

• (A)  ketone
• (B)  Aldehyde
• (C)  Alkene then – COOH
• (D)  Ester

Answer

Submitted By :Ali Uppal

Which of the following compounds has the empirical formula CH2O and reacts with sodium hydroxide ?

• (A)  carbonic acid
• (B)  ethanol
• (C)  acetic acid
• (D)  methanoic acid

Answer

Submitted By :Ali Uppal

Aldehyde and ketone have same general formula for homologous series_________________?

• (A)  CnH2nO2n
• (B)  CnH2n
• (C)  CnH2nO
• (D)  CnH2nOn+1

Answer

Submitted By :Ali Uppal

On heating aldehydes with Fehlings solution we get a precipitate whose colour is_________________?

• (A)  pink
• (B)  black
• (C)  yellow
• (D)  brick red

Answer

Submitted By :Ali Uppal

Formalin consists of mixture of formaldehyde methyl alcohol and water Percentage of water in it is________________?

• (A)  60%
• (B)  50%
• (C)  52%
• (D)  8%

Answer

Submitted By :Ali Uppal