PG TRB Chemistry Syllabus. We covered all the PG TRB Chemistry Syllabus MCQs in this post for free so that you can practice well for the exam.
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PG TRB Chemistry Syllabus Objective for Students
The boiling point of carboxylic acids is higher than alcohols due to:
(A) Their larger size
(B) Strong dipole-dipole interaction
(C) Strong bond between carbon and oxygen
(D) Formation of dimer through strong intermolecular H bonding.
Option d – Formation of dimer through strong intermolecular H bonding
Water is removed from ethanoic acid to get glacial acetic acid by:
(A) Distillation
(B) Heating
(C) Steam distillation
(D) Cooling at 289.5 K
Option d – Cooling at 289.5 K
Vinegar is ……….% aqueous solution of acetic acid.
(A) 30
(B) 12 to 22
(C) 17 to 28
(D) 6 to 8
Option d – 6 to 8
During the formation of hydrogen bonding in water and carboxylic acids, how many molecules of carboxylic acids are linked to a water molecule?
(A) Four
(B) Three
(C) Two
(D) One
Option b – Three
Alkanals and alkanones undergo reactions.
(A) Electrophilic substitution
(B) Electrophilic addition
(C) Nucleophilic addition
(D) Nucleophilic substitution
Option c – Nucleophilic addition
The most reactive compound toward nucleophilic addition reaction is:
(A) Ethyl methyl ketone
(B) Dimethyl ketone
(C) Ethanal
(D) Methanal
Option d – Methanal
Alkanones are less reactive than alkanals towards nucleophilic addition reaction due to:
(A) More steric hindrance of two alkyl groups
(B) More +I effect of two alkyl groups
(C) Less electron-deficient nature of carbonyl carbon
(D) All of these
Option d – All of these
Formalin is used for the preservation of:
(A) Biological and anatomical specimens
(B) Butter
(C) Chewing gum
(D) Baked food
Option a – Biological and anatomical specimens
Methanal is available commercially as a solid polymer called:
(A) Metaldehyde
(B) Paraldehyde
(C) Paraformaldehyde
(D) Aldimine
Option c – Paraformaldehyde
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