NEET Speed Test for Chemistry :
NEET Speed Test for Chemistry : MCQ with Answer and Reaction Mechanism are best possible question for various exams like itinerates BSc and MSc in chemistry, appearing in entrance examination like NCERT board, JEE advance, NEET, entrance exams for master in IITs like JAM as well as examination for Ph.D. like UGC-CSIR NET- JRF in organic chemistry as well GATE in chemical sciences,12th state board exams, and state level examination
JAM 2012
Q.9 The species/compounds that are aromatic among the following are
(A) R and S (B) P and Q (C) Q and S (D) P and S
Answer:
Q.10 The major product obtained in the reaction below is
Q.11 The rates of acetolysis for the following norbornyl derivatives are in the order
Q.12 The Haworth projection for α-anomer of D-glucose is
Q.14 The order of nucleophilicity of the following anions in a SN2 reaction is
Answer:
Q.15 The pair of conformation that has maximum energy difference is
Q.16 The major mono-sulfonation product of α-tetralone is
Q.17 Electrophilic nitration of the following compounds follow the trend
(A) S > R > P > Q (B) R > S > P > Q (C) R > P > S > Q (D) P > S > R > Q
Answer:
Q.18 The compounds those would not respond to tests of both nitrogen and sulfur with sodium fusion extracts are
Answer:
Q.19 The correct epimeric pair of the following is
Answer:
Q.20 α-Farnesene shown below is a
(A) diterpene having two isoprene units
(B) triterpene having three isoprene units
(C) triterpene having four isoprene units
(D) sesquiterpene having three isoprene units
Answer:
Q.36
(a) Write the structures of E, F and G in the following scheme of reactions
(b) Identify the structures of H and I in the following synthetic transformation
(a) Complete the following reaction sequence with appropriate structures of J, K and L
(b) Identify the structures of M and N in the following synthetic transformation
Q.38
(a) In the following reaction scheme, write the structures of O, P and Q.
(b) Given below are structures of some natural products. Identify them as vitamin A, B6, C, and D and classify them according to their classes (isoprenoid, alkaloid, carbohydrate and steroid)
Q.39
(a) Write the appropriate structures for R, S and T in the following scheme.
(b) Choose the correct stereoisomer between U and V that would furnish W on controlled hydrolysis. Write the stable conformation of W.
JAM 2015
Q.5 The major product formed in the following reaction is
Q.6 The structure of (2S,3R)-2-amino-3-hydroxy butanoic acid is
Q.7 The ene-yne that produces a chiral compound upon treatment with Lindlar’s catalyst is
Q.8 An organic compound P (C4H8O) is positive to Bayer’s test, but inert to sodium metal. On treatment with conc. HCl, P gives CH3CH2Cl and CH3CHO. The structure of P is
Q.13 The reagent ‘oxine’ commonly used in analytical chemistry is
Q.17 The set of products formed in the following reaction is
Q.19 The correct order of the pKa values for the conjugate acids of heterocyclic compounds given below is
Q.20 The correct order of the 1 H NMR chemical shift values (d) for the indicated hydrogens (in bold) in the following compounds is
Q.23 The major product formed in the following reaction is
Q.29 Identify the correct reagents required for the following transformation
(B) (i) LiAlH4; (ii) H3O+
(C) (i) HOCH2CH2OH, H+; (ii) LiAlH4; (iii) H3O+
(D) (i) HSCH2CH2SH, H+; (ii) LiAlH4; (iii) H3O+
Answer:
Q.4 Which of the following statement(s) is/are true about the reaction given below?
Q.5 The reaction(s) which give(s) phenol is/are
Q.6 Which of the following species is/are aromatic in nature?
Q.7 Which of the following compound(s) show(s) only two signals in 1H NMR and a strong IR band at~1690 cm−1?
Q.15 The total number of compounds (shown below) that form phenylhydrazone derivatives under acidic
conditions is _
Q.1 The correct order of pKa for the following compounds is
Q.2 The major product formed in the following reaction is
Q.3 The mechanism of the following transformation involves
(A) Aldol reaction and Cannizzaro reaction
(B) Aldol reaction and Claisen-Schmidt reaction
(C) Knoevenagel condensation and Cannizzaro reaction
(D) Stobbe condensation and Cannizzaro reaction
Answer: A
Q.4 The most basic amino acid among the following is
(A) tyrosine
(B) methionine
(C) arginine
(D) glutamine
Answer: C
Q. 5 The correct order of 1H NMR chemical shift () values for the labeled methyl groups in the following compound is
(B) Me3 < Me4 < Me1 < Me2
(C) Me3 < Me1 < Me4 < Me2
(D) Me2 < Me4 < Me3 < Me1
Answer: B
Q.6 Among the following, the most stable conformation of meso-2,3 dibromobutane is
Q.7 The major products X and Y in the following reaction sequence are
Answer: D
Q.8 The major product formed in the reaction of butanenitrile with phenylmagnesium bromide followed by acidification is
Q.9 An organic compound on reaction with 2,4-dinitrophenylhydrazine (2,4-DNP) gives a yellow precipitate. It also gives silver mirror on reaction with ammoniacal AgNO3. It gives an alcohol and sodium salt of a carboxylic acid on reaction with concentrated NaOH. It yields benzene-1,2-dicarboxylic acid on heating with alkaline KMnO4. The structure of the compound among the following is
Q.10 The major products X and Y in the following reaction sequence are
Q.11 The correct statement(s) about the following species is(are)
(B) II and III are resonance structures
(C) II and III are diastereomers
(D) III is a tautomer of I
Answer: C;D
Q.12 Consider the following reaction:
Among the following, the compound(s) whose osazone derivative(s) will have the same melting
point as that of X is(are)
Q.13 The appropriate reagents required for carrying out the following transformation are
(B) (i) CrO3, H2SO4, aq. acetone (ii) Ac2O, NaOAc
(C) (i) MnO2; (ii) CH2(CO2H)2, piperidine, pyridine
(D) (i) PCC, CH2Cl2; (ii) BrCH2CO2C(CH3)3, Zn (iii) H3O+, heat
Answer: A;C;D
Q.14 The appropriate reagents required for carrying out the following transformation are
(B) (i) maleic anhydride, AlCl3; (ii) H2N-NH2, KOH; (iii) H2SO4
(C) (i) succinic anhydride, FeCl3; (ii) LiAlH4; (iii) H2SO4
(D) (i) phthalic anhydride, F3B·OEt2; (ii) HS(CH2)2SH, H+; (iii) Raney Ni; (iv) polyphosphoric acid\
Answer: A
Q.15 Among the following, the number of molecules that are aromatic is __.
Q.16 Among the following, the number of compounds, which can participate as ‘diene’ component in a Diels-Alder reaction is __.
Q.17 Among the following, the number of molecules that possess C2 axis of symmetry is __.
JAM 2018
Q.5 The major product formed in the following reaction is
Q.6 The compound that contains the most acidic hydrogen is
Q.7 The C-2 epimer of D-glucose is
(A) D-Mannose (B) D-Fructose (C) D-Galactose (D) D-Gulose
Answer: A
Q.17 The CORRECT order of stability for the following carbocations is
(A) I < III < IV < II (B) III < II < IV < I (C) II < IV < III < I (D) IV < III < I < II
Answer: C
Q.18 Among the dimethylcyclohexanes, which one can be obtained in enantiopure form?
Q.19 The major product formed in the following reaction is
Q.20 The product X in the following reaction sequence is
Q.21 The major product formed in the following reaction is
Q.22 The major products Y and Z in the following reaction sequence are
Q.23 The CORRECT order of carbonyl stretching frequencies for the following compounds is
(C) IV < II < III < I (D) III < IV < II < I
Answer: D
Q.24 The sequence of three steps involved in the following conversion is
(A) (i) Friedel-Crafts alkylation; (ii) Reduction; (iii) Friedel-Crafts acylation
(B) (i) Friedel-Crafts acylation; (ii) Friedel-Crafts alkylation; (iii) Reduction
(C) (i) Friedel-Crafts acylation; (ii) Reduction; (iii) Friedel-Crafts alkylation
(D) (i) Friedel-Crafts alkylation; (ii) Friedel-Crafts acylation; (iii) Reduction
Answer: B
Q.35 On reaction with NaNO2 and HCl, which of the following amino alcohol(s) will yield compound P?
Q.36 The CORRECT statement(s) about carbene is(are)
(A) Carbene is a neutral species
(B) Carbene is an intermediate in the Curtius rearrangement
(C) Carbene can insert into both and π-bonds
(D) Carbene is generated from amines on reaction with nitrous acid
Answer: A,C
Q.37 The compound(s) that shows(show) positive haloform test is(are)
Q.38 Tetrapeptide(s) that gives(give) the following product on reaction with Sanger’s reagent followed
by hydrolysis is(are)
(A) Ala-Gly-Leu-Phe (B) Asp-Phe-Leu-Pro
(C) Asp-Gly-Tyr-Phe (D) Ala-Phe-Tyr-Pro
Answer: A,D
Q.43 Among the following hydrocarbon(s), how many of them would give rise to three groups of proton
NMR peaks with 2:2:3 integration ratio?
Q.45 The number of hydrogen bond(s) present in a guanine-cytosine base pair is __.
Answer:
Q.44 The number of stereoisomers possible for the following compound is __.
Q.55 The number of compounds having S-configuration among the following is _.
Q.8 The correct option for the major products of the following reaction is
JAM 2019
Q.9 The major product formed in the following reaction is
Q.24 The major product of the following reaction is
Q.25 In 1H NMR spectrum of the given molecule, the correct order of chemical shifts of the labelled protons (HX, HY, HZ) is
(B) HZ > HY > HX
(C) HX > HY > HZ
(D) HY > HX > HZ
Answer:
Q.26 In the following reaction of (D)-Glucose, a product P is formed.
identical reaction conditions is
Q.27 The major product of the following reaction is
NEET Speed Test for Chemistry
Q.28 The correct option for the product(s) of the following reaction is
Q.29 The increasing order of acidity of the given molecules in aqueous media is
Q.30 The compound formed upon subjecting an aliphatic amine to Lassaigne’s test is
(A) NaNH2
(B) NaNO2
(C) NaCN
D) NaN3
Answer:
Q.37 The compound(s) formed as intermediate(s) in the following reaction sequence is/are
Q.38 The correct statement(s) among the following is/are
(A) Secondary structure of a polypeptide describes the number and type of amino acid
residues.
(B) Uracil is a pyrimidine nucleobase.
(C) Natural fatty acids have odd number of carbon atoms.
(D) Reaction of (D)-glucose with Ca(OH)2 gives a product mixture containing (D)-
fructose, (D)-mannose, and (D)-glucose.
Answer:
Q.39 The diastereomeric pair(s) among the following option(s) is/are
Q.40 The reaction(s) that result(s) in the formation of aromatic species is/are
Q.48 Based on the information given below, the isoelectric point (pI) of lysine is __.
(Round off to one decimal place)
Q.50 The number of gauche-butane interaction(s) in the following compound is__________.
Q.59 5.3 g of benzaldehyde was reacted with an excess of acetophenone to produce 5.2 g of the enone product as per the reaction shown below. The yield of the reaction is __ %.
(Round off to the nearest integer)
JAM 2020
Q.2 For the radical chain reaction below, the correct classification for step 2 and step 3 is,
respectively,
(A) chain propagating, chain terminating
(B) chain branching, chain terminating
(C) chain propagating, chain propagating
(D) chain propagating, chain branching
Answer:
Q.4 The nucleobase NOT found in DNA is
(A) Thymine (B) Uracil
(C) Guanine (D) Adenine
Answer:
Q.5 The correct statement for the following structures is
(A) 1, 2 and 3 are resonance structures
(B) 1 and 2 are resonance structures, whereas 3 is an isomer of 1 and 2
(C) 1 and 3 are resonance structures, whereas 2 is an isomer of 1 and 3
(D) 1, 2 and 3 are constitutional isomers
Answer:
Q.6 The correct order of boiling points of compounds I-IV is
(A) II > I > III > IV (B) II > III > I > IV
(C) I > III > IV > II (D) I > IV > III > II
Answer:
Q.10 The amino acid with R configuration is
Q.15 The major product formed in the following reaction sequence is
Q.25 The major product formed in the following reaction is
Q.26 The rate of solvolysis of I-IV follows
(A) I > II > III > IV (B) III > I > II > IV
(C) III > II > I > IV (D) IV > I > II > III
Answer:
Q.27 The more stable species in each pair of conformers are
(C) II, III and V (D) I, IV and VI
Answer:
Q.28 The major product formed in the following reaction sequence is
NEET Speed Test for Chemistry
Q.29 For the Diels-Alder reactions I-IV, the activation barriers follow the order
(C) III > IV > II > I (D) IV > III > II > I
Answer:
Q.30 The major product formed in the following reaction is
Q.37 Achiral stereoisomer(s) is(are) possible for
Q.38 The compound(s) which will have only two signals in the 1H NMR spectrum in 3:2 ratio is(are)
Q.39 The correct sequence of reactions for the synthesis of the following molecule is(are)
(B) (i) Cyclopropyl bromide, Mg, ether (ii) 4-Hydroxybenzaldehyde, THF (iii) CsCO3, MeI, THF
(C) (i) 4-Iodophenol, CsCO3, MeI, THF (ii) Mg, ether (iii) Cyclopropane carboxaldehyde, THF
(D) (i) Cyclopropyl bromide, Mg, ether (ii) Methyl 4-methoxybenzoate, THF
Answer:
Q.59 The total number of tautomers possible for I and II together is __
Q.60 The total number of head to tail isoprene linkages in the following molecule is __
JAM 2021
Q.5 The major product formed in the following reaction is
Q.6 The major product formed in the following reaction is
Q.7 A compound shows 1H NMR peaks at δ-values (in ppm) 7.31 (2H), 7.21 (2H), 4.5 (2H) and 2.3 (3H). The structure of the compound is
Q.8 The major product formed in the following reaction is
Q.18 The major product formed in the following reaction sequence is
Q.19 The products P, Q, R and S formed in the following reactions are
Q.20 The major products E and F formed in the following reactions are
Q.21 The reaction that produces the following as a major product is
Q.22 The major product formed in the following reaction is
NEET Speed Test for Chemistry
Q.23 The major product formed in the following reaction is
Q.24 In the following reaction, compound Q is
Q.35 Hantzsch pyridine synthesis involves several steps. Some of those are
(A) Aldol reaction (B) Darzens reaction
(C) Mannich reaction (D) Michael addition
Answer:
Q.36 The compound(s), which give(s) benzoic acid on oxidation with KMnO4, is (are)
Q.37 The products P and Q formed in the reaction are
Q.38 The functional group(s) in reducing sugar that tests positive with Tollen’s reagent is (are)
(A) Aldehyde (B) Ketone
(C) Hemi-acetal (D) Acetal
Answer:
Q.39 Among the following, the anti-aromatic compound(s) is (are)
Q.46 Among the following, the total number of terpenes(terpenoids) is __.
Q.60 For the molecule,
CH3−CH=CH−CH(OH)−CH=CH−CH=C(CH3)2
the number of all possible stereoisomers is __.
Answer:
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