WBCS Mains Chemistry Organic Chemistry & Biomolecules Questions 2023

Q. Triglycerides are broken down to
(A) Fatty acids
(B) Amino acids
(C) Glycerol
(D) Fatty acid and glycerol

Correct Answer: (D) Fatty acid and glycerol

Q. The element that is required for the synthesis of chlorophyll is
(A) Mn
(B) Fe
(C) Mg
(D) Mo

Correct Answer: (C) Mg

Q. Which of the following gases causes the formation of Carbamino haemoglobin?
(A) CO
(B) CO₂
(C) NO₂
(D) SO₂

Correct Answer: (B) CO₂

Q. Which of the following carbohydrates is not a monosaccharide?
(A) Glucose
(B) Fructose
(C) Ribose
(D) Lactose

Correct Answer: (D) Lactose

WBCS Mains Chemistry Organic Chemistry & Biomolecules Questions 2021

Q. Which of the following is not a reducing sugar?
(A) Glucose
(B) Maltose
(C) Sucrose
(D) Lactose

Correct Answer: (C) Sucrose

WBCS Mains Chemistry Organic Chemistry & Biomolecules Questions 2020

Q. The chemical formula C₂H₅OH stands for
(A) Methane
(B) Methanol
(C) Ethane
(D) Ethanol

Correct Answer: (D) Ethanol

WBCS Mains Chemistry Organic Chemistry & Biomolecules Questions 2019

Q. The homologue of ethyne is
(A) C₂H₂
(B) C₂H₆
(C) C₃H₄
(D) C₃H₈

Correct Answer: (C) C₃H₄

Q. The general molecular formula for disaccharide is
(A) C₁₀H₂₀O₁₀
(B) C₁₂H₂₂O₁₁
(C) C₁₂H₂₀O₁₀
(D) C₁₂H₂₂O₁₀

Correct Answer: (B) C₁₂H₂₂O₁₁

WBCS Mains Chemistry Organic Chemistry & Biomolecules Questions 2018

Q. Which of the following heterocyclic compound is not aromatic?
(A) Pyridine
(B) Pyrrole
(C) Furan
(D) Piperidine

Correct Answer: (D) Piperidine

WBCS Mains Chemistry Organic Chemistry & Biomolecules Questions 2017

Q. Crude petroleum is converted to a number of hydrocarbon products by
(A) Fractional distillation
(B) Thermal cracking
(C) Steam distillation
(D) None of the above

Correct Answer: (A) Fractional distillation

Q. Tollen’s reagent is
(A) Alkaline mercuric chloride
(B) Alkaline potassium permanganate
(C) Ammoniacal silver nitrate
(D) Ammonium citrate

Correct Answer: (C) Ammoniacal silver nitrate

Q. Paraffin wax is
(A) Ester
(B) Alcohol
(C) Unsaturated hydrocarbons
(D) Saturated hydrocarbons

Correct Answer: (D) Saturated hydrocarbons

Q. Diazo-coupling reaction between diazonium salt and naphthol produces
(A) Green dye
(B) Yellow dye
(C) Red dye
(D) Blue dye

Correct Answer: (C) Red dye

Q. Chemical formula of Grignard reagent is
(A) R-Mg-X
(B) R-Ca-X
(C) R-Sr-X
(D) None of the above

Correct Answer: (A) R-Mg-X

Q. The hydrolysis of cane sugar is catalyzed by
(A) H⁺
(B) Enzymes
(C) Mineral acid
(D) All of the above

Correct Answer: (D) All of the above

WBCS Mains Chemistry Organic Chemistry & Biomolecules Questions 2015

Q. Which one is the correct sequence in increasing order of molecular weights of the hydrocarbons?
(A) Methane, ethane, propane and butane
(B) Propane, butane, ethane and methane
(C) Butane, ethane, propane and methane
(D) Butane, propane, ethane and methane

Correct Answer: (A) Methane, ethane, propane and butane

WBCS Mains Chemistry Organic Chemistry & Biomolecules Questions 2014

Q. Naphthalene has the formula
(A) C₆H₆
(B) C₁₀H₈
(C) C₁₂H₁₀
(D) C₁₂H₁₂

Correct Answer: (B) C₁₀H₈