Description : Quinoline undergoes nucleophilic substitution on heating with NaNH2 to give (a) 2-Aminoquinoline (b) 4-Aminoquinoline (c) 3-Aminoquinoline (d) 8-Aminoquinoline
Last Answer : 2-Aminoquinoline
Description : Pyridine undergoes electrophilic substitution with fuming H2SO4 at 350°C to give (a) 2-Pyridinesulfonic acid (b) 4-Pyridinesulfonic acid (c) 3-Pyridinesulfonic acid (d) None of these
Last Answer : 3-Pyridinesulfonic acid
Description : Which of the following reagents will react with furan to form 2-furansulfonic acid? (a) SO3 in pyridine at 100°C (b) Dilute H2SO4 at 200°C (c) SO2 at 100°C (d) Dilute H2SO4 at 100°C
Last Answer : SO3 in pyridine at 100°C
Description : Anthracene undergoes electrophilic substitution reactions mainly at (a) C-1 (b) C-2 (c) C-9 (d) C-1 and C-2
Last Answer : C-9
Description : Benzene undergoes substitution reaction more easily than addition reaction because (a) it has a cyclic structure (b) it has three double bonds (c) it has six hydrogen atoms (d) there is delocalization of electrons
Last Answer : there is delocalization of electrons
Description : An organic compound (A) has a molecular weight 78 and an empirical formula CH. (A) is resistant to attack by oxidizing agents but undergoes substitution and addition reactions. X-ray analysis shows that the ... suggests that compound (A) is (a) Benzene (b) Cyclohexane (c) Toluene (d) n-Hexane
Last Answer : Benzene
Description : Acetyl chloride undergoes nucleophilic substitution at a faster rate than methyl acetate because __________. (a) the ester is more sterically hindered than the acid chloride (b) the acid chloride is ... is a better leaving group than chloride (d) chloride is a better leaving group than methoxide
Last Answer : chloride is a better leaving group than methoxide
Description : 1,2-Dichloroethane reacts with excess of NaNH2 to form (a) Vinyl chloride (b) Ethylene (c) Ethyl chloride (d) Acetylene
Last Answer : Acetylene
Description : 1-Butyne reacts with (a) NaNH2 (b) Dil H2SO4 and HgSO4 (c) HBr (d) All of these
Last Answer : All of these
Description : Which of the following undergoes nucleophilic substitution exclusively by `S_(N^(1))` mechanism?
Last Answer : Which of the following undergoes nucleophilic substitution exclusively by `S_(N^(1))` ... Isopropyl chloride C. Chlorobenzene D. Benzyl chloride
Description : Which of the following compounds undergoes mucleophilic substitution reaction most easily?
Last Answer : Which of the following compounds undergoes mucleophilic substitution reaction most easily? A. B. C. D.
Description : Pyridine reacts with HCl to form (a) Pyridinium chloride (b) 2-Chloropyridine (c) 3-Chloropyridine (d) All of these
Last Answer : Pyridinium chloride
Description : Furan reacts with ammonia in the presence of alumina at 400°C to give (a) Pyridine (b) Furfural (c) Pyrrole (d) Furoic acid
Last Answer : Pyrrole
Description : Pyridine reacts with a mixture of KNO3 and H2SO4 at 300°C to give (a) 1-Nitropyridine (b) 2-Nitropyridine (c) 3-Nitropyridine (d) 4-Nitropyridine
Last Answer : 3-Nitropyridine
Description : Pyridine is less basic than trimethylamine because the lone-pair of electrons on N-atom in pyridine resides in (a) sp2 hybrid orbital (b) sp hybrid orbital (c) sp3 hybrid orbital (d) p-orbital
Last Answer : sp2 hybrid orbita
Description : Pyrrole is less basic than pyridine because the lone-pair of electrons on Natom in pyrrole (a) is part of the delocalized π molecular orbital. (b) is not part of the delocalized π molecular orbital. (c) resides in sp2 hybrid orbital (d) resides in sp hybrid orbital
Last Answer : is part of the delocalized π molecular orbital.
Description : Pyridine has a delocalized π molecular orbital containing (a) 4 electrons (b) 6 electrons (c) 8 electrons (d) 12 electrons
Last Answer : 6 electrons
Description : The ‘N’ atom in pyridine is (a) sp3 hybridized (b) sp2 hybridized (c) sp hybridized (d) cannot be predicted
Last Answer : sp2 hybridized
Description : Which of the following heterocyclic compounds is not aromatic? (a) Pyridine (b) Pyrrole (c) Furan (d) Piperidine
Last Answer : Piperidine
Description : A compound gives a positive Tollens' test but negative Ninhydrin test. It is (a) a protein (b) an amino acid (c) a monosaccharide (d) pyridine
Last Answer : a monosaccharide
Description : Collin’s Reagent is? a. K2Cr2O7/H2SO4 b. PCC/CH2Cl2 c. PDC/DCM d. CrO3/pyridine
Last Answer : d. CrO3/pyridine
Description : Denatured spirit is ethanol mixed with (1) Petrol (2) Kerosene (3) Water (4) Pyridine
Last Answer : Pyridine
Description : Water has maximum density at – (1) -4°C (2) 0°C (3) 4°C (4) 100°C
Last Answer : (3) 4°C Explanation: When cooled from room temperature liquid water becomes increasingly dense, as with other substances, but at approximately 4 °C (39 °F), pure water reaches its maximum density.
Description : a zero-order reaction for every 10° rise of temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of the reaction will become: (1) 128 times (2) 256 times (3) 512 times (4) 64 times
Last Answer : 512times
Description : 2. In a zero-order reaction for every 10° rise of temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of the reaction will become: (1) 128 times (2) 256 times (3) 512 times (4) 64 times
Last Answer : 256 times
Description : The number of geometric isomers that can exist for square planar `[Pt(Cl)(py)(NH_(3))(NH_(2)OH)]^(+)` is (py=pyridine)
Last Answer : The number of geometric isomers that can exist for square planar `[Pt(Cl)(py)(NH_(3))(NH_(2)OH)]^(+)` is (py=pyridine) A. 2 B. 3 C. 4 D. 6
Description : In the following compounds piperidine (I), pyridine (II), morpholine (III) and pyerrole (IV), the order of basicity is :
Last Answer : In the following compounds piperidine (I), pyridine (II), morpholine (III) and pyerrole ( ... `IIIgtIgtIVgtII` C. `IIgtIgtIIIgtIV` D. `IgtIIIgtIIgtIV`
Description : The reaction of p-aminophenol with one mole of actyl chloride in presence of pyridine gives:
Last Answer : The reaction of p-aminophenol with one mole of actyl chloride in presence of pyridine gives: A. B. C. D.
Description : Ethyl alcohol containing 9.5% methyl alcohol and 0.5 % pyridine is called
Last Answer : Ethyl alcohol containing 9.5% methyl alcohol and 0.5 % pyridine is called A. Spirit B. Denaturated spirit C. Rectified spirit D. Absolute alcohol
Description : Goitrogenic substance present in cabbage is (A) 5-vinyl-2 thio oxalzolidone (B) Pyridine-3-carboxylic acid (C) 3-Hydroxy-4, 5-dihydroxymethyl1–2-methyl pyridine (D) δ-ALA dehydratase
Last Answer : Answer : A
Description : Niacin or nicotinic acid is a monocarboxylic acid derivative of (A) Pyridine (B) Pyrimidine (C) Flavin (D) Adenine
Description : Mature erythrocytes do not contain (A) Glycolytic enzymes(B) HMP shunt enzymes (C) Pyridine nucleotide(D) ATP
Last Answer : C
Description : Caprolactam, a raw material for the manufacture of nylon-6, isproduced from (A) Phenol (B) Naphthalene (C) Benzene (D) Pyridine
Last Answer : (C) Benzene
Description : Which is an anticing compound? (A) Amyl nitrate (B) Alcohols (C) Mercaptans (D) Pyridine
Last Answer : (B) Alcohols
Description : Which of the following is used for making the explosive ‘TNT’? (A) Benzol (B) Toluene (C) Pyridine (D) Cerosote
Last Answer : (B) Toluene
Description : Caprolactam (a raw material for nylon-6 manufacture) is produced from (A) Phenol (B) Naphthalene (C) Benzene (D) Pyridine
Last Answer : (A) Pyridine
Description : Growth regulating herbicides that act simi lar to that of endogenous auxin (IAA) a). Benzoic acid b). pyridine carboxylic acid c). quinoline carboxylic acid d). All
Last Answer : d). All
Description : . Monocot are natural resistant to a). Triazine b). Pyrimidine c). Pyridine d). Atrazine
Last Answer : a). Triazine
Description : Which of the following is NOT a nitrogenous waste compound excreted by animals? a) urea b) ammonia c) uric acid d) pyridine
Last Answer : ANSWER: D -- PYRIDINE
Description : At what temperature is gypsum heated to form Plaster of Paris?a) 90°C b) 100°C c) 110°C d) 120°C
Last Answer : b) 100°C
Description : Acetone reacts with HCN to form a cyanohydrin. It is an example of (a) Electrophilic addition (b) Electrophilic substitution (c) Nucleophilic addition (d) Nucleophilic substitution
Last Answer : Nucleophilic addition
Description : Propene reacts with bromine to form 1,2-dibromopropane. This is an example of (a) Nucleophilic addition (b) Electrophilic addition (c) Nucleophilic substitution (d) Electrophilic substitution
Last Answer : Electrophilic addition
Description : The pH of water at 25°C is 7. When it is heated to 100°C, then what will be the pH of water?
Last Answer : – Remains same
Description : DNA is (A) Usually present in tissues as a nucleo protein and cannot be separated from its protein component (B) A long chain polymer in which the internucleotide linkages are of the diester type between C-3 ... linkages are between C-2' and C-5' (D) Hydrolyzed by weal alkali (pH9 to 100°C)
Last Answer : Answer : B
Description : Bence jones proteinurial characterized by (A) Non-heat coagulability (B) Heat coagulability at 100°C (C) Heat coagulability at 45 to 60°C (D) Precipitation at 25°C
Last Answer : Answer : C
Description : The boiling point of ammonia is (a) -100°C (b) -50°C (c) - 33.3°C (d) 33.3°C.
Last Answer : Ans: c
Description : Water has maximum density at (a) Room temperature (b) 0°C (c) 4°C (d) 100°C
Last Answer : Ans:(c)