Namma Kalvi 12th Chemistry. We covered all the Namma Kalvi 12th Chemistry MCQs in this post for free so that you can practice well for the exam.
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Namma Kalvi 12th Chemistry Objective for Students
Diethyl ketone sodium bisulphite reacts with dilute acid or base to give:
(A) Pentanal
(B) Pentanone
(C) Butanal
(D) Butanone
Option b – Pentanone
The most acidic hydrogen atom in alkanals is located at the:
(A) Delta position
(B) Gamma position
(C) Alpha position
(D) Beta position
Option c – Alpha position
The detection of the oxo group in an organic compound can be done using:
(A) Tetracarbonyl nickel
(B) Sodium nitropruside
(C) Sodium dicyano aurate
(D) Lithium hydrido aluminate
Option b – Sodium nitropruside
The anion of propanone obtained by alkali reacts with nitropruside ion to give a red-colored complex, indicating the presence of:
(A) Ester group
(B) Formyl group
(C) Ether group
(D) Oxo group
Option d – Oxo group
The anion of a ketone formed by alkali reacts with nitropruside ion to give a:
(A) Black-colored complex
(B) Violet-colored complex
(C) Red-colored complex
(D) Blue-colored complex
Option c – Red-colored complex
The least reactive compound towards hydrogen cyanide is:
(A) Ethyl methyl ketone
(B) Dimethyl ketone
(C) Ethanal
(D) Methanal
Option a – Ethyl methyl ketone
Mendelonitrile is prepared from:
(A) Ethanal and hydrazine
(B) Ethanal and formonitrile
(C) Propanone and ammonia
(D) Benzene carbaldehyde and formonitrile
Option d – Benzene carbaldehyde and formonitrile
Cyanohydrin formation is a “step-up” reaction as a new:
(A) Carbon-Nitrogen single bond is formed.
(B) Carbon-Oxygen single bond is formed.
(C) Carbon-Carbon single bond is formed.
(D) Carbon-Sulphur single bond is formed.
Option c – Carbon-Carbon single bond is formed
Propanone reacts with formonitrile to give:
(A) Dimethyl ketone cyanohydrin
(B) Ethanal cyanohydrin
(C) Propanal cyanohydrin
(D) Propane nitrile
Option a – Dimethyl ketone cyanohydrin
During the reaction between ethanal and ammonical silver nitrate, the oxidation state of silver changes from:
(A) +3 to zero
(B) +2 to +3
(C) +1 to zero
(D) +1 to +2
Option c – +1 to zero
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