Organic Chemistry Class 11 MCQ. We covered all the Organic Chemistry Class 11 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Organic Chemistry for NEET Students
0.189 g of an organic compound gave 0.287 g of silver chloride by Carius method. Find the percentage of chlorine in the compound. (At. Mass of Ag = 108)
(A) 18.87%
(B) 37.57%
(C) 48.49%
(D) 57.75 %
Option b – 37.57%
0.185 g of an organic compound produced 0.319 g of AgBr by Carius method. Find the percentage of bromine in the compound (At. Mass of Ag = 108, Br = 80)
(A) 23.37%
(B) 47.74%
(C) 73.77%
(D) 88.87%
Option c – 73.77%
In the structure of 4-isopropyl-2,4,5-trimethylheptane, number of 1°, 2° and 3° hydrogens are …….. respectively
(A) 18, 6, 2
(B) 21,4,3
(C) 18,4, 3
(D) 21,5,4
Option b – 21,4,3
Glycerol is purified by distillation under reduced pressure, because ………
(A) it is stabilized by intra-molecular hydrogen bonding
(B) it has high molecular mass
(C) it is viscous
(D) it decomposes at its boiling point
Option d – it decomposes at its boiling point
1.5 g of an organic compound in a quantitative determination of phoshorous gave 2.5 g of Mg2P2O7. Calculate the percentage of phosphorous in the compound. (Mg = 24, P = 31)
(A) 15.57%
(B) 31.14%
(C) 46.55%
(D) 62.28%
Option c – 46.55%
In Kjeldahl’s method, CuSO4 acts as a ……….
(A) reducing agent
(B) oxidising agent
(C) dehydrating agent
(D) catalyst
Option d – catalyst
The geometrical shape of carbocation is ……….
(A) linear with one lone pair of electrons
(B) trigonal planar with empty unhybridized p-orbital
(C) planar with unhybridized orbital containing unpaired electron
(D) tetrahedral with sp³ hybrid orbital containing lone pair of electrons.
Option b – trigonal planar with empty unhybridized p-orbital
Salicylaldehyde is separated from p-hydroxybenzaldehyde using ……….
(A) column chromatography
(B) distillation in vacuum
(C) steam distillation
(D) crystallization
Option c – steam distillation
0.25 g of an organic compound gave 0.35 g of BaSO4. Find the percentage of sulphur in the compound. (Ba = 137, S = 32)
(A) 19.23%
(B) 37.04%
(C) 55.40%
(D) 74.09%
Option a – 19.23%
In Dumas method, 0.5 g of an organic compound gave 35 mL of nitrogen at STP. The percentage of nitrogen is ………
(A) 10.25
(B) 8.75
(C) 5.64
(D) 12.24
Option b – 8.75
An electrophilic reagent must have ……….
(A) completely filled atomic orbitals
(B) vacant orbital
(C) an orbital containing one electron
(D) an orbital containing two electrons
Option b – vacant orbital
The CI-C-Cl angle in 1,1,2,2-tetracholoroethene and tetrachloromethane are ………. respectively.
(A) 120° and 109.5°
(B) 90° and 109.5⁰
(C) 109.5° and 90°
(D) 109.5° and 120⁰
Option a – 120° and 109.5°
During nitrogen estimation of an organic compound by Kjeldahl’s method, the ammonia evolved by 0.4 g of the compound is neutralized by 8 mL of IM H₂SO4. Calculate the percentage of nitrogen in the compound.
(A) 84 %
(B) 32%
(C) 20%
(D) 56%
Option d – 56%
In which of the following molecules C-atom is present in both sp and sp’ states?
(A) Ethane
(B) 1,3-Butadiene
(C) Acetonitrile
(D) Propan-2-one
Option c – Acetonitrile
A certain organic compound was found to contain 33.8% C, 5.6% H and 49.6% chlorine. Find the empirical formula of the organic compound.
(A) C5H8Cl₂O
(B) C5H5Cl5O
(C) C4H6Cl4O
(D) C4H8Cl₂O
Option d – C4H8Cl₂O
Which of the following is INCORRECT statement?
(A) Inductive effect implies the atoms ability to cause bond polarization.
(B) Resonance structures of molecule do not have identical arrangement of atoms.
(C) Electromeric effect involves temporary displacement of electrons.
(D) Hypercojugation is known as no-bond resonance.
Option b – Resonance structures of molecule do not have identical arrangement of atoms.
Number of hyperconjugation structures shown by isopropyl cation are ………
(A) four
(B) nine
(C) six
(D) three
Option c – six
Identify the INCORRECT statement w.r.t. Kjeldahl’s method of nitrogen estimation.
(A) Presence of nitrogen in isoquinoline can be estimated.
(B) Potassium sulphate is used as boiling point elevator for H₂SO4.
(C) Copper sulphate acts as a catalyst.
(D) Nitrogen is first converted into ammonium sulphate.
Option a – Presence of nitrogen in isoquinoline can be estimated.
Which of the following statements is CORRECT?
(A) Alkyl free radical has a planar structure.
(B) Carbanion has a pyramidal structure.
(C) Carbocation has a trigonal planar structure.
(D) All of these.
Option d – All of these.
How many sigma and pi-bonds are present in the molecule of 1,2-dicyanoethene?
(A) 3 sigma and 3 pi
(B) 5 sigma and 2 pi
(C) 7 sigma and 5 pi
(D) 2 sigma and 3 pi
Option c – 7 sigma and 5 pi
0.25 g of an organic compound was analyzed nitrogen by Dumas method. 32.9 mL of for moist nitrogen was collected at 25° C and 755.8 mm of Hg pressure. Calculate the percentage of nitrogen in the sample. (Aq. tension of water at 25° C is 23.8 mm of Hg)
(A) 45.5%
(B) 20.05%
(C) 14.5%
(D) 33.3 %
Option c – 14.5%
Empirical formula of an organic compound having molecular mass 60 is CH₂O. What is its molecular formula?
(A) C4H8O4
(B) C₂H4O₂
(C) C3H6O3
(D) C6H12O6
Option b – C₂H4O₂
Find the CORRECT decreasing order of -I effect with reference to hydrogen.
(A) – NO₂>-COOH>-F>- CN
(B) -COOH > NO₂>-F> – CN
(C) – F>-CN>-COOH > NO₂
(D) -NO₂>-CN>-COOH > – F
Option d – -NO₂>-CN>-COOH > – F
Which of the following compounds have sp hybridized carbon atom? i. CH₂ = C = CH₂ ii. CH₂=CH-CN iii. CH, – CH = CH, iv. O=CH,
(A) (i) (iv)
(B) (ii)
(C) (ii) (iii)
(D) (i) (ii)
Option d – (i) (ii)
Kjeldahl’s method CANNOT be used for the estimation of nitrogen in ……… i. C6H5-N=N-C6H5 ii. C6H5CONH2, C5H5N iv. C6H5NO₂
(A) (i), (ii)
(B) (ii), (iii)
(C) (i), (iii), (iv)
(D) (ii), (iv)
Option c – (i), (iii), (iv)
In ………. chromatography, both stationary and mobile phases are liquid.
(A) column
(B) paper
(C) thin layer
(D) both (A) and (B)
Option b – paper
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