Dr Viraf J Dalal Chemistry Class 8. We covered all the Dr Viraf J Dalal Chemistry Class 8 MCQs in this post for free so that you can practice well for the exam.
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Dr Viraf J Dalal Chemistry Class 8 Objective for Students
Alkanals without an α-hydrogen atom, on heating with conc. NaOH undergoes oxidation and reduction to form a mixture of carboxylic acid and alcohol. This reaction is called:
(A) Wolff-Kishner reaction
(B) Clemmensen’s reaction
(C) Haloform reaction
(D) Cannizzaro’s reaction
Option d – Cannizzaro’s reaction
Formaldehyde, on heating with 50% caustic soda, forms:
(A) A mixture of methanol and sodium formate
(B) A mixture of ethanol and potassium formate
(C) A mixture of propanol and sodium acetate
(D) A mixture of methanal and sodium methanoate
Option a – A mixture of methanol and sodium formate
Neovaleraldehyde and benzene carbaldehyde, on heating with 50% NaOH, form how many different disproportionation products?
(A) Three
(B) Four
(C) Five
(D) Six
Option b – Four
The major product formed during the crossed Cannizzaro’s reaction between formaldehyde and benzaldehyde is:
(A) Methyl alcohol and alkali formate
(B) Benzyl alcohol and alkali benzoate
(C) Benzyl alcohol and alkali formate
(D) Methyl alcohol and alkali formate
Option c – Benzyl alcohol and alkali formate
During the cross aldol condensation between methanal and ethanal, the major product is:
(A) Simple condensation of methanal
(B) Simple condensation product of ethanal
(C) Crossed condensation product
(D) Condensation cannot take place
Option c – Crossed condensation product
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