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Which of the following molecules can act as a nucleophile and an electrophile?

A. CH3NH2 B. CH3Cl C. CH3CN D. CH3OH Solution: (A) We will look at how CH3NH2 act as a nucleophile and an electrophile; CH3NH2 as a... View Article

Which among the following pairs of molecules can be distinguished by haloform reaction?

A. CH3CHO and CH3COCH3 B. CH3CHO and CH3CH2OH C. CH3OH and CH3CH2OH D. HCHO and CH3CHO Solution: (C and D) Only methyl ketones or alcohols... View Article

Which one of the following halogen compounds is difficult to be hydrolysed by SN 1 mechanism?

A. Tertiary butyl chloride B. Isopropyl chloride C. Benzyl chloride D. Chlorobenzene E. Allyl chloride Solution: (D) The C−Cl bond present... View Article

The number of helium atoms present in 320 amu helium is

Solution: (80) Number of atoms = Mass of substance / Atomic Mass Given, Mass of Helium = 320 amu Atomic mass of He = 4 Number of atoms = 320... View Article

Which of the following complexes have the longest M-C bond length?

A. Mn(CO)6]+ B. Cr(CO)6] C. Fe(CO)5] D. V(CO)6]− Solution: (A) The electron density on metal is less in Mn(CO)6]+ so it has the longest M-C... View Article

The density of methane at 2.0 atm pressure and 27 degrees centigrade is

A. 0.13gL-1 B. 0.26gL-1 C. 1.30gL-1 D. 26.0gL-1 Solution: (C) Given that Methane at 27°C and 2 atm Hence, T = 27°C = 300 K P = 2 atm We... View Article

Which of the following is the major product when 1-butanol is heated with concentrated H2SO4?

A. 1-butene B. Cis-2-butene C. Trans-2-butene D. All of these Solution: (C) Trans-2-butene is the major product when 1-butanol is heated... View Article

Which of the following pair cannot be separated by NaHSO3?

Solution: (C) NaHSO3 can react mainly with aldehyde and methyl ketone. If we... View Article

The density of a mixture of O2 and N2 is 1.33g/L

Solution: (0.28 atm) Let 1 mol of gas be present. So, 22.4 L will be the volume of the mixture Density = volume / mass The Molar Mass of the... View Article

The volumes of 4 N HCl and 10 N HCl required to make 1 litre of 6 N HCI are

A. 0.75 litre of 10 N HCI and 0.25 litre of 4 NHCI B. 0.25 litre of 4 N HCI and 0.75 litre of 10 NHCI C. 0.67 litre of 4 N HCI and 0.33 litre of... View Article

How many benzene based isomers are possible by the compound C7H8O?

Solution: (5) For aromatic compound C7H8O, the total number of isomers possible is 5. They are as follows:... View Article

The activation energies of the two reactions are E1 and E2 with E1 > E2. If the temperature of the reacting system is increased from T1 (rate constants are K1 and K2) to T2(rate constants are K1’ and K2’ ) predict which of the following alternative is correct?

A. K1′ / K1 < K2′ / K2 B. K1′ / K1 > K2′ / K2 C. K1′ / K1 = K2′ / K2 D. K1 / K1′ < K2 / K2′ Solution: (B) If we take the first... View Article

Which of the following reactions will result in the formation of a chiral centre in the product?

A. CH3CH = CH2HBr → B. CH2 = CH2 + HOBr → C. CH3CH2CH = CH2 + HBr →H2O2 D. CH3CH2CH = CH2 + HBr → Solution: (D) If we look at or consider... View Article

What is formed when ammonium iodide is treated with conc. H2SO4?

On addition of conc. H2SO4 to an iodide salt, violet fumes are formed due to the formation of iodine (I2) gas.... View Article

A compound which can be used in space vehicles both to absorb CO2 and liberate O2 is.

The compound that can be used in space vehicles both to absorb CO2 and liberate O2 is 2Na202. 2Na2O2 + 2CO2 → 2Na2CO3 + O2... View Article

Passing H2S gas into a mixture of Mn2+, Ni2+, Cu2+ and Hg2+ ions in an acidified aqueous solution precipitates

H2S in an acidic medium or if it is added in an aqueous acidified solution tends to precipitate as sulphide of Cu and Hg in the form of insoluble... View Article

End product when phenyl magnesium bromide reacts with t-butanol

When Phenyl Magnesium Bromide reacts with t-butanol, benzene is obtained as the product. As for the reaction process, it forms benzene because... View Article

Which of the following reaction is not a redox reaction?(A) Combustion (B) Double displacement (C) Synthesis of two elements (D) Decomposition into elements

The Correct Answer is (B) Double displacement Solution: A double displacement reaction is not a redox reaction. This is because in this... View Article

Covalency of carbon in carbon dioxide is:

(A) 1 (B) 2 (C) 3 (D) 4 The Correct Answer is (D) 4. Solution: The covalency of carbon in carbon dioxide is 4. In carbon dioxide O... View Article

The total number of electrons in 4.2 g of N3−ion is:

(A) 3NA (B) 3.2NA (C) 2.1NA (D) 4.2NA The Correct Answer is (A) 3NA Solution: N3- = 4.2 g = moles = 0.3 moles If one mole of... View Article

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