Dr Dalal Chemistry for Class 8. We covered all the Dr Dalal Chemistry for Class 8 MCQs in this post for free so that you can practice well for the exam.
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Dr Dalal Chemistry Objective for Class 8 Students
A reagent that, on reacting with carboxylic acids, does not indicate acidic character in acids:
(A) Caustic soda
(B) Sodium bicarbonate
(C) Zinc metal
(D) Ethanol
Option d – Ethanol
The Formyl group in benzene carbaldehyde is not:
(A) Ortho, para directing
(B) Meta directing
(C) Electron-attracting
(D) Deactivating
Option a – Ortho, para directing
Aromatic aldehydes undergo a type of reaction of the aromatic ring:
(A) Electrophilic addition
(B) Electrophilic substitution
(C) Nucleophilic substitution
(D) Nucleophilic addition
Option b – Electrophilic substitution
Benzaldehyde reacts with a nitrating mixture and gives:
(A) m-Nitrobenzaldehyde
(B) o-Nitrobenzaldehyde
(C) p-Nitrobenzaldehyde
(D) 2,4,6-triNitrobenzaldehyde
Option a – m-Nitrobenzaldehyde
The reduction product of 2-methyl propanal is:
(A) Isobutane
(B) 2-Methyl propan-1-ol
(C) Isobutyl alcohol
(D) All of these
Option d – All of these
Acetaldehyde, on reacting with PCC, produces:
(A) Nitroethane
(B) Ethyl alcohol
(C) Ethylene
(D) Ethanoic acid
Option d – Ethanoic acid
Acetophenone, on treating with sodium amalgam and water, gives:
(A) Phenyl carbinol
(B) Toluene
(C) Phenyl methyl carbinol
(D) n-Propyl benzene
Option c – Phenyl methyl carbinol
Phenyl propanone, on heating with zinc-amalgam and conc. hydrochloric acid produces:
(A) 1-Phenyl propanal
(B) 1-Phenyl propan-1-ol
(C) 1-Phenyl propan-2-ol
(D) n-Propyl benzene
Option d – n-Propyl benzene
The reductant used to convert methyl phenyl ketone into ethyl benzene is:
(A) Sodium amalgam and water
(B) Lithium aluminum hydride
(C) Sodium borohydride
(D) Zinc amalgam and conc. HCl
Option d – Zinc amalgam and conc. HCl
We covered all the dr dalal chemistry for class 8 mcqs above in this post for free so that you can practice well for the exam.
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