Description : meso-Tartaric acid is (a) sometimes optically active (b) always optically active (c) sometimes optically inactive (d) always optically inactive
Last Answer : always optically inactive
Description : Which of the following is a true statement? (a) All chiral molecules possess a plane of symmetry. (b) All achiral molecules are meso. (c) All molecules which possess a single asymmetric center of the S configuration are levorotatory. (d) A mixture of achiral compounds will be optically inactive
Last Answer : A mixture of achiral compounds will be optically inactive
Description : Total number of optically active stereoisomers of tartaric acid is
Last Answer : Total number of optically active stereoisomers of tartaric acid is A. 2 B. 4 C. 3 D. 0
Description : The reference compound for absolute configuration of optically active compound is (A) Alanine (B) Lactic acid (C) Glyceraldehyde (D) Dihydroxy acetone
Last Answer : Answer : C
Description : Which of the following is/are optically inactive? (a) a 50-50 mixture of R and S enantiomers (b) a meso compound (c) a racemic mixture (d) all the above
Last Answer : all the above
Description : A meso compound : (a) is an achiral molecule which contains chiral carbons (b) contains a plane of symmetry or a centre of symmetry (c) is optically inactive (d) is characterized by all of the above
Last Answer : ) is characterized by all of the above
Description : Which of the following compounds will be optically active? (a) Propanoic acid (b) 3-Chloropropanoic acid (c) 2-Chloropropanoic acid (d) 3-Chloropropene
Last Answer : 2-Chloropropanoic acid
Description : Sour milk contains – (1) acetic acid (2) tartaric acid (3) citric acid (4) lactic acid
Last Answer : (4) lactic acid \ Explanation: Lactic acid, also known as milk acid, is a chemical compound that plays a role in various biochemical processes and was first isolated in 1780 by the Swedish ... kefir, and some cottage cheeses. The casein in fermented milk is coagulated (curdled) by lactic acid.
Description : Curd is sour due to presence of – (1) Tartaric acid (2) Lactic acid (3) Acetic acid (4) Oxalic acid
Last Answer : (2) Lactic acid Explanation: Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid ... solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey.
Description : Sour milk contains (1) acetic acid (2) tartaric acid (3) citric acid (4) lactic acid
Last Answer : lactic acid
Description : Curd is sour due to presence of (1) Tartaric acid (2) Lactic acid (3) Acetic acid (4) Oxalic acid
Last Answer : Lactic acid
Description : On reduction with LiAlH4, which of the following compounds could yield an optically active compound? (a) Propanal (b) Propanone (c) Butanal (d) Butanone
Last Answer : Butanone
Description : Which acid is present in lemon? (1) marlic acid (2) citric acid (3) lactic acid (4) tartaric acid
Last Answer : (2) citric acid Explanation: Citric acid is a weak organic acid with the formula C6H8O7.The juice of the lemon is about 5% to 6% citric acid, which gives a sour taste.
Description : Which acid is present in lemon – (1) malic acid (2) citric acid (3) lactic acid (4) tartaric acid
Last Answer : (2) citric acid Explanation: The main organic acids contained in the flesh of lemons are citric acid and malic acid. The sourness of citrus fruit is the taste of citric acid.
Description : Acid present in Tomato is (A)Lactic acid (B) Tartaric acid (C) Oxalic acid (D) Citric acid
Last Answer : (C) Oxalic acid
Description : Nettle sting is a natural source of which acid? a) Methanoic acid b) Lactic acid c) Citric acid d) Tartaric acid
Last Answer : a) Methanoic acid
Description : Which acid is produced when milk gets sour? (1) Tartaric acid (2) Butyric acid (3) Lactic acid (4) Acetic acid
Last Answer : (3) Lactic acid
Description : Optically active compounds are capable of (A) Different reactions (B) Rotating plane of polarized light (C) Showing same chemical properties (D) None of these
Last Answer : Answer : B
Description : The order of increasing acidity is : (a) chloroacetic acid > formic acid > benzoic acid (b) benzoic acid > formic acid > chloroacetic acid (c) all are the same (d) not determinable from available data
Last Answer : chloroacetic acid > formic acid > benzoic acid
Description : Optical isomers that are not mirror images are called (a) Diastereomers (b) Enantiomers (c) Metamers (d) Meso compounds
Last Answer : Diastereomers
Description : The amino acid which is not optically active is (A) Alanine (B) Glycine (C) Glutamine (D) Lysine
Description : Which of the following statements is false about glyceraldehyde? (a) Its IUPAC name is 1,2-dihydroxypropanal (b) It is isomeric with 1,3-dihydroxypropanone (c) It is optically active (d) It shows mutarotation
Last Answer : It shows mutarotation
Description : 2-Butanol is optically active because it contains : (a) an asymmetric carbon (b) a plane of symmetry (c) a hydroxyl group (d) a centre of symmetry
Last Answer : (a) an asymmetric carbon
Description : Enantiomers have which of the following characteristics? (a) rotate ordinary light (b) have the same melting point (c) are superimposable mirror images (d) react with optically active molecules at the same rate
Last Answer : have the same melting point
Description : An optically active compound (a) must contain atleast four carbons (b) when in solution rotate the plane of polarized light (c) must always contain an asymmetric carbon atom (d) in solution always give a negative reading in polarimeter
Last Answer : when in solution rotate the plane of polarized light
Description : Select the option which is not correct with respect to enzyme action. (a) Substrate binds with enzyme at its active site. (b) Addition of lot of succinate does not reverse the inhibition ... from that which binds the substrate. (d) Malonate is a competitive inhibitor of succinic dehydrogenase.
Last Answer : (b) Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.
Description : Ethyl acetoacetate undergoes acid-hydrolysis with dilute HCl to form (a) Acetoacetic acid (b) Succinic acid (c) Acetic acid (d) Adipic acid
Last Answer : Acetoacetic acid
Description : In succinic acid, HOOC(CH2)nCOOH, n is equal to (a) 1 (b) 2 (c) 3 (d) 4
Last Answer : 2
Description : Total number of optically active stereoisomers of `CH_(3)-underset(overset(|)(CI))(C)H-CH=CH-underset(overset(|)(CI))(C)H-CH_(3)` are :
Last Answer : Total number of optically active stereoisomers of `CH_(3)-underset(overset(|)(CI))(C)H-CH=CH-underset(overset(|)(CI))(C)H-CH_(3)` are :
Description : Which of the following amine is optically active?1
Last Answer : Which of the following amine is optically active?1 A. `CH_(3)NH_(2)` B. `CH_(3)NHC_(2)H_(5)` C. D. sec-Butylamine
Description : Optically active amine having molecular formula `C_(5)H_(13)N` on reaction with `NaNO_(2)+HCI` produces, `3^(@)` optically inative alcohol. Find out s
Last Answer : Optically active amine having molecular formula `C_(5)H_(13)N` on reaction with `NaNO_(2)+HCI` produces, ` ... out structures of amines: A. B. C. D.
Description : Statement-I: Optically active 2-idoibutane on treatment with `NaI` in acetone undergoes racemisation. Because Statement-II: Repeated Walden inversions
Last Answer : Statement-I: Optically active 2-idoibutane on treatment with `NaI` in acetone undergoes racemisation. ... Statement-1 is false, Statement-2 is true
Description : All the following amino acids are optically active except (A) Tryptophane (B) Phenylalanine (C) Valine (D) Glycine
Last Answer : Answer : D
Description : All amino acids are optically active except (A) Glycine (B) Serine (C) Threonine (D) Tryptophan
Last Answer : Answer : A
Description : Petroleum (A) Is optically active (B) Constitutes mainly of olefins (C) Does not contain asphalt (D) Does not contain aromatics
Last Answer : (A) Is optically active
Description : X-ray crystallographic analysis of an optically active compound determines its (A) Optical rotatory dispersive power (B) Absolute configuration (C) Relative configuration (D) Optical purity
Last Answer : (B) Absolute configuration
Description : What is meso compound ?
Last Answer : Even if a compound has asymmetric carbon atoms, if one part of the compound alleviates the surface rotation of the polarized light of the other part, so that the sum as a whole is light inactive, then such a compound is called meso compound.
Description : Which of the statements below correctly describes an achiral molecule? (a) The molecule has a nonsuperimposable mirror image. (b) The molecule exhibits optical activity when it interacts with plane-polarized light. (c) The molecule has an enantiomer. (d) The molecule might be a meso form
Last Answer : The molecule might be a meso form
Description : ______ is used for making vinegar. (1) Tartaric acid (2) Mahe acid (3) Oxalic acid (4) Acetic acid
Last Answer : (4) Acetic acid Explanation: Vinegar is a liquid consisting mainly of acetic acid (CH3COON) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
Description : The substance most commonly used as a food preservative is – (1) sodium carbonate (2) tartaric acid (3) acetic acid (4) sodium salt of benzoic acid
Last Answer : (4) sodium salt of benzoic acid Explanation: A preservative is a naturally occurring or synthetically produced substance that is added to products such as foods, pharmaceuticals, paints, biological ... can be antioxidants such as oxygen absorbers, which inhibit the oxidation of food constituents.
Description : ______ is used for making vinegar. (1) Tartaric acid (2) Malic acid (3) Oxalic acid (4) Acetic acid
Last Answer : (4) Acetic acid Explanation: Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water.
Description : Check the incorrect statement : (a) Acetic acid is present in sour milk (b) Formic acid is present in insect bites (c) Tartaric acid is present in grapes (d) Citric acid is a tricarboxylic acid
Last Answer : Acetic acid is present in sour milk
Description : ____ is used for making vinegar. (1) Tartaric acid (2) Malic acid (3) Oxalic acid (4) Acetic acid
Last Answer : Acetic acid
Description : The substance most commonly used as a food preservative is (1) sodium carbonate (2) tartaric acid (3) acetic acid (4) sodium salt of benzoic acid
Last Answer : sodium salt of benzoic acid
Description : What type of acid is succinic acid and where is it ?
Last Answer : An organic acid. Raw mangoes are available.
Description : Iron absorption is hampered by (A) Ascorbic acid (B) Succinic acid (C) Phytic acid (D) Amino acid
Description : An example of feedback inhibition is (A) Allosteric inhibition of hexokinase by glucose6-phosphate (B) Cyanide action on cytochrome (C) Sulpha drug on folic acid synthesizer bacteria (D) Reaction between succinic dehydrogenase and succinic acid
Description : Sakaguchi reaction is answered by (A) Lysine (B) Ornithine (C) Arginine (D) Arginino succinic acid
Description : Out of 24 mols of ATP formed in TCA cycle, 2 molecules of ATP can be formed at “substrate level” by which of the following reaction ? (A) Citric acid→ Isocitric acid (B) Isocitrate→ Oxaloacetate (C) Succinic acid→ Fumarate (D) Succinylcat→ Succinic acid
Last Answer : D