WorksheetsCSIR NET Chemistry Orientation Quiz
Total questions: 30
Worksheet time: 15mins
Which of the following obeys 18-electron rule?
Fe(CO)₅
Ni(CO)₄
Cr(CO)₆
All of the above
Which lanthanide ion shows maximum paramagnetism?
Ce³⁺
Gd³⁺
Eu²⁺
Yb³⁺
Bioorthogonal chemistry refers to chemical reactions that:
Occur only at high temperatures
Occur in water-insoluble environments
Occur inside living systems without disrupting native biochemical processes
Are used only in industrial synthesis
The Woodward-Fieser rules are applied to predict:
IR absorption maxima
UV-visible λ_max
Mass fragmentation pattern
NMR splitting
"Click chemistry" is a term coined by:
K. Barry Sharpless
Frances Arnold
Carolyn Bertozzi
Jean-Marie Lehn
Debye-Hückel limiting law is applicable to:
Strong electrolytes at high concentration
Weak electrolytes at low concentration
Strong electrolytes at infinite dilution
None of the above
Which of the following is used as an internal standard in NMR?
TFA
DMSO
TMS
CDCl₃
Which metal ion is present in vitamin B12?
Fe
Co
Zn
Cu
Which award is considered India's highest scientific honor and sometimes a stepping stone to Nobel?
Bharat Ratna
Shanti Swarup Bhatnagar Prize
Infosys Prize
INSA Fellowship
In aldol condensation, the enolate ion acts as a:
Nucleophile
Electrophile
Base
Leaving group
The van't Hoff factor 'i' becomes greater than 1 in case of:
Non-electrolytes
Strong electrolytes
Weak electrolytes
Covalent solutes
A higher λ_max in UV-Vis spectroscopy generally indicates:
Greater energy gap
Lower energy gap
Less conjugation
Saturated compound
Who won the 2023 Nobel Prize in Chemistry for the discovery and development of quantum dots?
Carolyn Bertozzi, Morten Meldal, Barry Sharpless
Carolyn Bertozzi, David MacMillan, Benjamin List
Moungi Bawendi, Louis Brus, Alexei Ekimov
Emmanuelle Charpentier, Jennifer Doudna, Reinhard Genzel
Why does an E2 reaction require a periplanar geometry?
For stabilization of the carbocation
For orbital overlap between β-H and leaving group
To allow carbene intermediate
To stabilize the conjugate base
In IR spectroscopy, the C≡C stretching frequency appears around:
1700 cm⁻¹
2200 cm⁻¹
3300 cm⁻¹
1450 cm⁻¹
In ¹H NMR spectroscopy, deshielding causes:
Upfield shift
Downfield shift
No change
Decrease in coupling constant
The invention of the pH scale is credited to:
Arrhenius
Niels Bohr
S.P.L. Sørensen
Linus Pauling
Who coined the term "organic chemistry"?
Friedrich Wöhler
Justus von Liebig
Berzelius
Kekulé
The first synthesis of urea from ammonium cyanate was done by:
Berzelius
Wöhler
Kekulé
Pasteur
The discovery of X-rays was made by:
Roentgen
Curie
Becquerel
Rutherford
If two compounds have the same molecular formula but different refractive indices and boiling points, they are:
Isomers
Resonance structures
Conformers
Tautomers
In a UV spectrum, a bathochromic shift indicates:
Shorter λmax
Greater energy gap
Longer λmax due to conjugation
Molecule is unstable
Which will undergo faster hydrolysis in aqueous medium?
CH₃COCl
CH₃CONH₂
CH₃COOCH₃
CH₃COOH
Which intermediate is formed in the Beckmann rearrangement?
Carbocation
Nitrenium ion
Oxime
Rearranged amide
The reaction of phenol with chloroform and NaOH gives:
Anisole
Salicylaldehyde
Chlorobenzene
Benzaldehyde
Which named reaction gives nitriles from primary amides?
Hofmann
Beckmann
Schmidt
Lossen
Which of the following is least basic?
CH₃NH₂
NH₃
Aniline
Guanidine
The Curtius rearrangement involves which intermediate?
Carbocation
Carbanion
Isocyanate
Carbene
In the Perkin reaction, the product formed is a:
Hydrocarbon
Aromatic ketone
α,β-unsaturated acid
Diol
The Corey-Chaykovsky reaction is used to synthesize:
Ketones
Epoxides
Carboxylic acids
Ethers
