Explore topic-wise MCQs in UPSEE.

This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following is NOT a part of the primary protein structure?

A. the amino acid sequence
B. the disulfide linkages
C. the planar nature of the amide linkage
D. the conformation of the polypeptide backbone
Answer» E.
Discussion
2.

Which of the following amino acids is achiral?

A. alanine
B. glycine
C. serine
D. cysteine
Answer» C. serine
Discussion
3.

A glycoside is the carbohydrate form of an

A. ether.
B. acetal.
C. aglycone.
D. alcohol.
Answer» C. aglycone.
Discussion
4.

Which of the following compounds does NOT undergo mutarotation?

A. glucose
B. sucrose
C. ribose
D. fructose
Answer» C. ribose
Discussion
5.

Which of the following statements regarding the biosynthesis of cholesterol is FALSE?

A. Cholesterol has the same carbon skeleton as its biosynthetic precursor, lanosterol.
B. Cholesterol is derived from the dimerization of farnesyl pyrophosphate in a headto-head manner.
C. Cyclization of squalene to cholesterol is initiated by acid-catalyzed ring opening of an epoxide.
D. Cholesterol has three fewer carbon atoms than lanosterol.
Answer» B. Cholesterol is derived from the dimerization of farnesyl pyrophosphate in a headto-head manner.
Discussion
6.

Which of the following statements is NOT true regarding fatty acids?

A. Fatty acids dissolve in nonpolar solvents.
B. Triglycerides are esters of fatty acids
C. Most naturally occurring fatty acids have trans double bonds.
D. Fatty acids are biosynthesized from acetate.
Answer» D. Fatty acids are biosynthesized from acetate.
Discussion
7.

Supply the correct words to complete this sentence: Electron-withdrawing groups such as nitro _________ the basicity of anilines, especially when substituted _______________.

A. increase ; ortho or para
B. increase ; meta
C. decrease ; ortho or para
D. decrease ; meta
Answer» D. decrease ; meta
Discussion
8.

Predict which of the following compounds will have a lower boiling point than 1- butanal.

A. 1-butanol
B. 2-butanol
C. 1-butene
D. butanoic acid
Answer» D. butanoic acid
Discussion
9.

Which of the following statements about organometallic compounds is FALSE?

A. Alkyllithium reagents (RLi) add to the carbonyl group of aldehydes and ketones.
B. Grignard reagents (RMgBr) add to the carbonyl group of aldehydes and ketones.
C. Alkyllithium and Grignard reagents do not add to esters.
D. Grignard reagents are prepared in ether or tetrahydrofuran (THF
Answer» D. Grignard reagents are prepared in ether or tetrahydrofuran (THF
Discussion
10.

Which of the following compounds gives a secondary alcohol upon reaction with methylmagnesium bromide? Assume the usual acid workup.

A. butyl formate
B. 3-pentanone
C. pentanal
D. methyl butanoate
Answer» D. methyl butanoate
Discussion
11.

The Williamson ether synthesis produces ethers by reacting an

A. alcohol with a metal.
B. alkoxide with a metal.
C. alkoxide with an alkyl halide.
D. alkyl halide with an aldehyde.
Answer» D. alkyl halide with an aldehyde.
Discussion
12.

Which version of the radical halogenation of an alkane is MOST selective?

A. fluorination
B. chlorination
C. bromination
D. iodination
Answer» D. iodination
Discussion
13.

Which of the following occurs during the initiation stage of a radical mechanism?

A. Nonradicals are formed from radicals.
B. Radicals are formed from other radicals.
C. Radicals are formed from nonradicals.
D. Nonradicals are formed from other nonradicals.
Answer» D. Nonradicals are formed from other nonradicals.
Discussion
14.

Which of the following cycloalkanes has the MOST strain energy?

A. cyclobutane
B. cyclopentane
C. cyclohexane
D. cycloheptane
Answer» B. cyclopentane
Discussion
15.

Which of the following cyclohexane conformations has the MOST energy (is the LEAST stable)?

A. chair
B. half-chair
C. boat
D. twist-boat
Answer» C. boat
Discussion
16.

Which of the following may be separated by ordinary physical methods?

A. a pair of identical molecules
B. a pair of enantiomers
C. a pair of diastereomers
D. a pair of identical atoms
Answer» D. a pair of identical atoms
Discussion
17.

When an external magnetic field is applied, what happens to the protons in a sample?

A. All protons align with the field.
B. All protons align opposite to the field.
C. Some protons align with the field and some align opposite to it.
D. All protons assume a random orientation
Answer» D. All protons assume a random orientation
Discussion
18.

Which of the following physical properties differ for each of a pair of enantiomers?

A. solubility in ethanol
B. direction of rotation of plane-polarized light
C. boiling point and melting point
D. index of refraction
Answer» C. boiling point and melting point
Discussion
19.

Which of the following statements about an sp hybridized carbon is FALSE?

A. It is divalent.
B. It forms bonds that are linear.
C. It has two p orbitals.
D. It always forms triple bonds to carbon.
Answer» E.
Discussion
20.

Select incorrect statement:

A. Homolytic fission results in the formation of free radicals
B. Heterolytic fission results in the formation of Lewis acid and Lewis base
C. Completion of the octet provides a major driving force for the Lewis acid-base reaction
D. Steric bulky group increases nucleophilicity.
Answer» E.
Discussion
21.

Select correct statement(s) about carbene:

A. It is obtained by photolysis of diazomethane or ketene
B. It can be inserted into alkene forming cycloalkane
C. It can exist as single or triplet
D. All the statements are true.
Answer» E.
Discussion