eSaral - JEE | NEET | Class 8-10 Exam Prep App

In the nitration of benzene using a mixture of conc.

Question: In the nitration of benzene using a mixture of conc. H2SO4 and conc. HNO3,the species which initiates the reaction is __________. (i) NO2 (ii) NO+ (iii) NO2+ (iv) NO2 Solution: Option (iii)NO2+ is the answer....

Evaluate the following integral:

Question: Evaluate the following integral: $\int \frac{2 x+1}{(x+1)(x-2)} d x$ Solution: Here the denominator is already factored. So let $\frac{2 x+1}{(x+1)(x-2)}=\frac{A}{x+1}+\frac{B}{x-2} \ldots \ldots$ (i) $\Rightarrow \frac{2 x+1}{(x+1)(x-2)}=\frac{A(x-2)+B(x+1)}{(x+1)(x-2)}$ $\Rightarrow 2 x+1=A(x-2)+B(x+1) \ldots \ldots($ ii $)$ We need to solve for $A$ and $B$. One way to do this is to pick values for $x$ which will cancel each variable. Put $x=2$ in the above equation, we get $\Rightar...

The gas evolved when methylamine

Question: The gas evolved when methylamine reacts with nitrous acid is __________. (i) NH3 (ii) N2 (iii) H2 (iv) C2H6 Solution: Option (ii)N2is the answer....

Methylamine reacts with HNO2

Question: Methylamine reacts with HNO2 to form _________. (i) CH3ON==O (ii) CH3OCH3 (iii) CH3OH (iv) CH3CHO Solution: Option (iii)CH3OH is the answer....

The correct increasing order of basic strength

Question: The correct increasing order of basic strength for the following compounds is _________. (i) II III I (ii) III I II (iii) III II I (iv) II I III Solution: Option (iv)II I III is the answer....

Hoffmann Bromamide Degradation reaction

Question: Hoffmann Bromamide Degradation reaction is shown by __________. (i) ArNH2 (ii) ArCONH2 (iii) ArNO2 (iv) ArCH2NH2 Solution: Option (ii)ArCONH2is the answer....

The best reagent for converting,

Question: The best reagent for converting, 2-phenylpropanamide into 1- phenylethanamine is ____. (i) excess H2/Pt (ii) NaOH/Br2 (iii) NaBH4/methanol (iv) LiAlH4/ether Solution: Option (ii) NaOH/Br2 is the answer....

The best reagent for converting 2–phenylpropanamide

Question: The best reagent for converting 2phenylpropanamide into 2-phenylpropanolamine is _____. (i) excess H2 (ii) Br2 in aqueous NaOH (iii) iodine in the presence of red phosphorus (iv) LiAlH4 in ether Solution: Option (iv)LiAlH4 in etheris the answer....

Amongst the given set of reactants,

Question: Amongst the given set of reactants, the most appropriate for preparing 2 amine is _____. (i) 2 RBr + NH3 (ii) 2 RBr + NaCN followed by H2/Pt (iii) 1 RNH2 + RCHO followed by H2/Pt (iv) 1 RBr (2 mol) + potassium phthalimide followed by H3O+/heat Solution: Option (iii)1 RNH2 + RCHO followed by H2/Pt is the answer....

The source of nitrogen in Gabriel synthesis

Question: The source of nitrogen in Gabriel synthesis of amines is _____________. (i) Sodium azide, NaN3 (ii) Sodium nitrite, NaNO2 (iii) Potassium cyanide, KCN (iv) Potassium phthalimide, C6H4(CO)2NK+ Solution: Option (iv) is the answer....

To prepare a 1° amine from an alkyl halide

Question: To prepare a 1 amine from an alkyl halide with simultaneous addition of one CH2 group in the carbon chain, the reagent used as a source of nitrogen is ___________. (i) Sodium amide, NaNH2 (ii) Sodium azide, NaN3 (iii) Potassium cyanide, KCN (iv) Potassium phthalimide, C6H4(CO)2NK+ Solution: Option (iii)Potassium cyanide, KCis the answer....

Which of the following reagents would

Question: Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine? (i) H2 (excess)/Pt (ii) LiAlH4 in ether (iii) Fe and HCl (iv) Sn and HCl Solution: Option (ii)LiAlH4 in ether is the answer....

Benzylamine may be alkylated as shown

Question: Benzylamine may be alkylated as shown in the following equation : C6H5CH2NH2 + RX C6H5CH2NHR Which of the following alkyl halides is best suited for this reaction through SN1 mechanism? (i) CH3Br (ii) C6H5Br (iii) C6H5CH2Br (iv) C2H5 Br Solution: Option (iii)C6H5CH2Bris the answer....

Which of the following is the weakest

Question: Which of the following is the weakest Brnsted base? Solution: Option (A) is the answer....

Amongst the following, the strongest base

Question: Amongst the following, the strongest base in aqueous medium is ____________. (i) CH3NH2 (ii) NCCH2NH2 (iii) (CH3)2 NH (iv) C6H5NHCH3 Solution: Option (iii)(CH3)2 NHis the answer....

Evaluate the following integrals -

Question: Evaluate the following integrals - $\int(2 x+5) \sqrt{10-4 x-3 x^{2}} d x$ Solution: Let $I=\int(2 x+5) \sqrt{10-4 x-3 x^{2}} d x$ Let us assume, $2 \mathrm{x}+5=\lambda \frac{\mathrm{d}}{\mathrm{dx}}\left(10-4 \mathrm{x}-3 \mathrm{x}^{2}\right)+\mu$ $\Rightarrow 2 x+5=\lambda\left[\frac{d}{d x}(10)-\frac{d}{d x}(4 x)-\frac{d}{d x}\left(3 x^{2}\right)\right]+\mu$ $\Rightarrow 2 x+5=\lambda\left[\frac{d}{d x}(10)-4 \frac{d}{d x}(x)-3 \frac{d}{d x}\left(x^{2}\right)\right]+\mu$ We know $...

The correct IUPAC name for CH2==CHCH2 NHCH3 is

Question: The correct IUPAC name for CH2==CHCH2 NHCH3 is (i) Allylmethylamine (ii) 2-amino-4-pentene (iii) 4-aminopent-1-ene (iv) N-methylprop-2-en-1-amine Solution: Option (iv)N-methylprop-2-en-1-amineis the answer....

Which of the following is a 3°

Question: Which of the following is a 3 amine? (i) 1-methylcyclohexylamine (ii) Triethylamine (iii) tert-butylamine (iv) N-methyl aniline Solution: Option (ii)Triethylamineis the answer....

Assertion: Aromatic aldehydes and formaldehyde undergo

Question: Assertion: Aromatic aldehydes and formaldehyde undergo Cannizaro reaction. Reason: Aromatic aldehydes are almost as reactive as formaldehyde. (i) Assertion and reason both are correct and the reason is the correct explanation of assertion. (ii) Assertion and reason both are wrong statements. (iii) The assertion is a correct statement but the reason is the wrong statement. (iv) The assertion is a wrong statement but the reason is the correct statement. (v) Assertion and reason both are ...

Assertion: The α-hydrogen atom in carbonyl compounds

Question: Assertion: The -hydrogen atom in carbonyl compounds is less acidic. Reason: The anion formed after the loss of the -hydrogen atom is resonance stabilised. (i) Assertion and reason both are correct and the reason is the correct explanation of assertion. (ii) Assertion and reason both are wrong statements. (iii) The assertion is a correct statement but the reason is the wrong statement. (iv) The assertion is a wrong statement but the reason is the correct statement. (v) Assertion and rea...

Assertion: Compounds containing —CHO group are easily

Question: Assertion: Compounds containing CHO group are easily oxidised to corresponding carboxylic acids. Reason: Carboxylic acids can be reduced to alcohols by treatment with LiAlH4 (i) Assertion and reason both are correct and the reason is the correct explanation of assertion. (ii) Assertion and reason both are wrong statements. (iii) The assertion is a correct statement but the reason is the wrong statement. (iv) The assertion is a wrong statement but the reason is the correct statement. (v...

Assertion: Formaldehyde is a planar molecule.

Question: Assertion: Formaldehyde is a planar molecule. Reason: It contains sp2 hybridised carbon atom. (i) Assertion and reason both are correct and the reason is the correct explanation of assertion. (ii) Assertion and reason both are wrong statements. (iii) The assertion is a correct statement but the reason is the wrong statement. (iv) The assertion is a wrong statement but the reason is the correct statement. (v) Assertion and reason both are correct statements but the reason is not the cor...

Match the example given in Column I

Question: Match the example given in Column I with the name of the reaction in Column II Solution: (i) is e (ii) is d (iii) is a (iv) is b (v) is f (vi) is c...

Match the reactions given in Column I with

Question: Match the reactions given in Column I with the suitable reagents given in Column II. Solution: (i) is c (ii) is d (iii) is a (iv) is b...

Match the acids given in Column I

Question: Match the acids given in Column I with their correct IUPAC names given in Column II. Solution: (i) is b (ii) is e (iii) is d (iv) is a (v) is c...

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