UHS MDCAT Past Paper 2022 Page 6

UHS MDCAT Past Paper 2022

101- In which of the following functional groups, the carbon atom is sp hybridized?

A. -CHO

B. -COOH

C. -CN

D. -COOR

View Answer

Answer : C. -CN

Description

102- The compounds containing R-SH functional group are known as:

A. Alcohols

B. Thio-alcohols

C. Thio-ether

D. Nitrile

View Answer

Answer : B. Thio-alcohols

Description

103- What is the number of isomers of a hydrocarbon having a molecular formula, CaHa?

A. 2

B. 3

C. 4

D. 5

View Answer

Answer : A. 2

Description

104- Alkylbenzene is formed when benzene is treated with an alkyl halide in the presence of anhydrous aluminum chloride. Identify the type of reaction.

A. Friedel-Crafts acylation reaction

B. Halogenation

C. Friedel-Crafts alkylation reaction

D. Sulphonation

View Answer

Answer: C. Friedel-Crafts alkylation reaction

Description

105- Three alternate single and double bonds in benzene are called?

A. Conjugate bonds

B. Coordinate covalent bonds

C. Fixed bonds

D. Ionic bonds

View Answer

Answer : A. Conjugate bonds

Description

106- Which of the following compound is more acidic?

A. Alkane

B. Alkene

C. Alkyne

D. Cycloalkane

View Answer

Answer : C. Alkyne

Description

107- Consider the chlorination of methane, the attack of chlorine free radical on methane form methyl free radical occurs in ?

A. Initiation step

B. Propagation step

C. Termination step

D. Last step

View Answer

Answer : B. Propagation step

Description

108- The ratio of sigma to pi electrons in benzene is?

A. 1:3

B. 3:1

C. 4:1

D. 1:4

View Answer

Answer : B. 3:1

Description

109- When halogen is removed from an alkyl halide a carbocation is formed, identify the most reactive carbocation?

A. Primary carbocation

B. Secondary carbocation

C. Tertiary carbocation

D. Methyl carbocation

View Answer

Answer : C. Tertiary carbocation

Description

110- Freon is commonly known as ?

A. Refrigerant

B. A solvent

C. Insecticides

D. A fire extinguisher

View Answer

Answer : A. Refrigerant

Description

111- Neopentylchloride belongs to which class of alkyl halides?

A. Primary alkyl halides

B. Secondary alkyl halides

C. Tertiary alkyl halides

D. Quaternary alkyl halides

View Answer

Answer : A. Primary alkyl halides

Description

112- What is the common name of 1,2,3-propanetriol?

A. Butyl alcohol

B. Glycol

C. Glycerol

D. Propyl alcohol

View Answer

Answer : C. Glycerol

Description

113- Benzene is formed when Na reacts with which of the following?

A. Alcohol

B. Butyl alcohol

C. Propanol

D. Phenol

View Answer

Answer : D. Phenol

Description

114- When Phenol reacts with formaldehyde, which of the following product is produced?

A. Adduct

B. Hydronium ion

C. Oxonium ion

D. Phenoxide ion

View Answer

Answer : A. Adduct

Description

115- Which of the following is the correct name of CH3CH2CH2COCH2CHO?

A. 3-oxo hexanal

B. 3-one hexanal

C. 3-oxo hexanol

D. 3 keto hexanol

View Answer

Answer : A. 3-oxo hexanal

Description

116- Which is the most suitable reagent for the conversion of R-CH2OH → RCHO?

A. KMnO₄/NaOH

B. K₂Cr₂O₇/H₂SO₄ (Conc.)

C. CrO₃

D. Cr₂O₄/H₂SO₄ (Conc.)

View Answer

Answer : D. Cr₂O₄/H₂SO₄ (Conc.)

Description

117- Which of the following is also called silver mirror test?

A. Benedict’s solution test

B. Fehling’s solution test

C. Iodoform test

D. Tollen’s reagent test

View Answer

Answer : D. Tollen's reagent test

Description

118- Which among the following have least pH?

A. CH₃CH₂COOH

B. CH₂ClCH₂COOH

C. CH₃CHCl₂ COOH

D. CH₃CH₂CH₂COOH

View Answer

Answer : C. CH₃CHCl₂ COOH

Description

119- If carboxylic acid and ketone groups C=O are present in a chain then final name will be given as?

A. oxo, ole acid

B. one, ole acid

C. Both 1 and 2

D. None of these

View Answer

Answer : A. oxo, ole acid

Description