Description : A primary amine can be identified by using (a) HCl (b) CHCl3 (c) NaOH (d) CHCl3 + KOH
Last Answer : CHCl3 + KOH
Description : Which of the following reagents is used to prepare benzenediazonium chloride from aniline? (a) NaNO2 + HCl (b) LiAlH4 (c) NH2NH2 + KOH (d) NaOH
Last Answer : NaNO2 + HCl
Description : Which of the reactions between the following pairs of reagents proceeds by a mechanism that may be described as an electrophilic substitution? (a) Benzene + Br2/FeBr3 (b) Propene + Br2 (c) Acetone + NH2NH2 (d) Ethyl bromide + aq KOH
Last Answer : Benzene + Br2/FeBr3
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 : Which of the following reagents will react with acetamide to form methylamine? (a) LiAlH4 (b) Br2/NaOH (c) PCl5 (d) H2/Ni
Last Answer : Br2/NaOH
Description : Ketones react with Grignard reagents to form an addition product which on hydrolysis gives a (a) Primary alcohol (b) Tertiary alcohol (c) Secondary alcohol (d) Ketal
Last Answer : Tertiary alcohol
Description : Which of the following reagents does not react with aniline? (a) Acetyl chloride (b) Acetic anhydride (c) Ammonia (d) Nitrous acid
Last Answer : Ammonia
Description : Which of the following reagents will react with methyl group rather than the benzene ring in methylbenzene? (a) Chlorine in the presence of uv light (b) CH3Cl in the presence of AlCl3 (c) CH3COCl in the presence of AlCl3 (d) Hydrogen in the presence of nickel
Last Answer : Chlorine in the presence of uv light
Description : Which of the following reagents will react readily with both aldehydes and ketones? (a) Grignard reagent (b) Fehling's reagent (c) Tollens' reagent (d) Schiff's reagen
Last Answer : Grignard reagent
Description : Which of the following reagents readily react with ethyl methyl ether? (a) NaOH (b) Conc HI (c) KMnO4 (d) H2O
Last Answer : Conc HI
Description : Which of the following reagents will react with propene? (a) Hot alkaline KMnO4 (b) Sodium metal (c) Cold dilute HNO3 (d) LiAlH4
Last Answer : Hot alkaline KMnO4
Description : Which one of the following pairs of compounds illustrates the law of multiple proportion? [EAMCET 1989] (A) H2O, Na2O (B) MgO, Na2O (C) Na2O, BaO (D) SnCl2, SnCl4
Last Answer : (D) SnCl2, SnCl4
Description : The number of N-MC groups in alkaloids is best estimate with the help of (A) HI (B) H2SO4 (C) (CH3CO)2 CO (D) CH3 Mg I
Last Answer : Answer : A
Description : Which one of the following substances will form strong hydrogen bonds? A HCOOH B CH3CN C CCl4 D SiH4 E CH3OCH3
Last Answer : A HCOOH
Description : which of the following reagents will not react with above compound?
Last Answer : which of the following reagents will not react with above compound? A. Na metal B. `AgNO_(3) + NH_(4)OH` C. `Cu_(2)Cl_(2) + NH_(4) OH` D. `NaHCO_(3)`
Description : Why is sncl2 more stable than sncl4 briefly?
Last Answer : Need answer
Description : Why does the boiling point of CH3NH2 less than HCOOH?
Last Answer : Ans:- HCOOH is associated with intermolecular H-bonding in greater extent then CH3NH2 and therefore HCOOH has higher boiling point than CH3NH2 .
Description : Why HCOOH does not give HVZ (Hell Volhand Zelinsky) reaction but CH3COOH does ?
Last Answer : Ans. CH3 COOH contains hydrogens and hence give HVZ reaction but HCOOH does not contain -hydrogen and hence does not give HVZ reaction.
Description : Anisole is formed when phenol is treated with (a) CH3I/NaOH (b) CH3CH2I/NaOH (c) CHCl3/NaOH (d) Acetic anhydride
Last Answer : CH3I/NaOH
Description : Which of the following will have the lowest boiling point? (a) CH3Cl (b) CH4 (c) CH2Cl2 (d) CHCl3
Last Answer : CH4
Description : Marsh gas mainly contains (a) CH2=CH2 (b) CH4 (c) H2S (d) CHCl3
Description : Point group D3h belong to the molecule a. BF3 b. NH3 c. CHCl3 d. CH3
Last Answer : a. BF3
Description : What is the difference between molecules 2O and O2? -Chemistry 9th
Last Answer : O2 is a molecule consisting of 2 atoms of oxygen. 2O denotes two seperate oxygen atoms. O2 is a molecule and thus it is stable. 2O, whichconsists of 2 different atoms and thus these 2 atoms are ready to combine with any other element like hydrogen.
Description : If a clock strikes once at 1’o clock, twice at 2’o clock and twelve times at 12’o clock and again once at 1’o clock and so on, how many times will the clock strike in the course of 2 days? a) 156 b) 312 c) 78 d) 288
Last Answer : b) 312
Description : What is the chemical formula for quartz? w) CaCO-3 x) SiO-2 y) Fe-2O-3 z) none of these
Last Answer : ANSWER: X -- SiO-2
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 : 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 : Which of the following heterocyclic compounds is not aromatic? (a) Pyridine (b) Pyrrole (c) Furan (d) Piperidine
Last Answer : Piperidine
Description : Pyrrole is ...... a. nonaromatic b. Aromitic c. Antiaromatic d. Aliphatic
Last Answer : b. Aromitic
Description : Stains of rust on clothes can be removed by – (1) Oxalic acid (2) Petrol (3) Alcohol (4) H2O2
Last Answer : (1) Oxalic acid Explanation: Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles. Acidic solutions work best for these stains. The important ingredient in these ... the iron and loosen it from the fabric, then hold it in suspension in the wash water.
Description : Chemical composition of heavy water is – (1) H2O2 (2) H2O (3) HDO (4) D2O
Last Answer : (4) D2O Explanation: The chemical composition of Heavy water (deuterium oxide) is 2H2O or D2O.
Description : In laboratory preparation of H2O2 from hydrated barium peroxide with sulphuric acid , anhydrous barium peroxide is not used Why ?
Last Answer : Ans-Because it forms a protective layer of barium sulphate over anhydrous barium peroxide
Description : Stains of rust on clothes can be removed by : (1) Oxalic acid (2) Petrol (3) Alcohol (4) H2O2
Last Answer : Oxalic acid
Description : The reaction `RCH_(2)CH_(2)COOH overset(Red P)underset(Br_(2))toRCH_(2)-underset(Br)underset(|)(C)HCOOH` is called as
Last Answer : The reaction `RCH_(2)CH_(2)COOH overset(Red P)underset(Br_(2))toRCH_(2)-underset(Br) ... reaction C. Reimer Teimann reaction D. Sandmeyer reaction
Description : Which is decreasing order of acidity in, `HCOOH(I), CH_(3)COOH(II), CH_(3)CH_(2)COOH(III) and C_(6)H_(5)COOH(IV)`?
Last Answer : Which is decreasing order of acidity in, `HCOOH(I), CH_(3)COOH(II), CH_(3)CH_(2)COOH( ... B. `IVgtIIIgtIIgtI` C. `IVgtIgtIIgtIII` D. `IgtIVgtIIgtIII`
Description : Identify type of the intermolecular forces in the following compounds. a. CH3 – OH b. CH2 = CH2 c. CHCl3
Last Answer : Identify type of the intermolecular forces in the following compounds. a. CH3 – OH b. CH2 = CH2 c. CHCl3 d. CH2Cl2
Description : What is the atomic mass of HCOOH(formic acid)?
Last Answer : The molar (not atomic) mass of HCOOH (formic acid) is 46,03g.
Description : Is CHCl3 polar bond?
Last Answer : Chloroform has a low polar covalent bond.
Description : Name the acid present in Ant sting and its chemical formula. (a) Methanoic acid and HCOOH (b) Formic acid and HCOOH (c) Acetic acid and CH3COOH (d) Both a and b
Last Answer : (d) Both a and b
Description : In pyrrole, The electron density is maximum on :
Last Answer : In pyrrole, The electron density is maximum on : A. 2 and 3 B. 2 and 4 C. 2 and 5 D. 3 and 4
Description : All mammalian steroid hormones are formed from (A) Purine (B) Pyrimidine (C) Cholesterol (D) Pyrrole
Last Answer : Answer : C
Description : During breakdown of haem, the methenyl bridge between the following two pyrrole rings is broken: (A) I and II (B) II and III (C) III and IV (D) IV and I
Description : Vitamin B12 has a complex ring structure (corrin ring) consisting of four (A) Purine rings (B) Pyrimidine rings (C) Pyrrole rings (D) Pteridine rings
Description : Which of the following is not a sulphur compound present in petroleum? (A) Thiophenes (B) Mercaptans (C) Sulphones (D) Pyrrole
Last Answer : (D) Pyrrole
Description : Chlorophyll a molecule at its carbon atom 3 of the pyrrole ring II has one of the following (a) carboxylic group (b) magnesium (c) aldehyde group (d) methyl group
Last Answer : d) methyl group.
Description : An isosteric replacement for carboxylic acid group is (A) pyrrole (B) isoxazole (C) phenol (D) tetrazole
Last Answer : (D)tetrazole
Description : how many atoms does H2O2?
Last Answer : 42 hydrogen and 2 oxygen
Description : Is H2O2 ionic or convalint?
Description : Thyroproxidase requires hydrogen peroxide as oxidizing agent. The H2O2 is produced by (A) FADH2 dependent enzyme (B) NADH dependent enzyme (C) NADP dependent enzyme (D) NADPH dependent enzyme
Last Answer : Answer : D
Description : Methemoglobin is formed as a result of the oxidation of haemoglobin by oxidation agent: (A) Oxygen of Air (B) H2O2 (C) K4Fe(CN)6 (D) KMnO4