JEE Chemistry Organic Chemistry Some Basic Principles and Techniques MCQs Set A

Question. Which of the following scientist proposed that a ‘vital force’ was responsible for the formation of organic compounds ?
(a) Berzilius
(b) Berthelot
(c) Wohler
(d) Kolbe

Answer: A

Question. First organic compound to be synthesised was
(a) urea
(b) cane sugar
(c) methane
(d) acetic acid

Answer: A

Question. Which of the following organic compound was synthesised by F. Wohler from an inorganic compound?
(a) Urea
(b) Chloroform
(c) Methane
(d) Acetic acid

Answer: A

Question. The discovery that shook the belief in the vital force theory was
(a) Wholer’s synthesis of urea from ammonium cyanate
(b) Fermentation of sugars
(c) Synthesis of indigo
(d) Stereoisomerism

Answer: A

Question. In laboratory, first organic compound was synthesised by
(a) Wohler
(b) Kekule
(c) Hennel
(d) Liebig

Answer: A

Question. Who is known as the “Father of Chemistry”?
(a) Lavoisier
(b) Priestley
(c) Faraday
(d) Rutherford

Answer: A

Question. The hybridisation of carbon atom in C — C single bond of H₂C = CH — CH = CH₂ is
(a) sp² — sp²
(b) sp³ — sp³
(c) sp² — sp
(d) sp³ — sp

Answer: A

Question. The percentage of s- character of the hybrid orbitals in ethane, ethene and ethyne are respectively
(a) 25, 33, 50
(b) 50, 75, 100
(c) 10, 20, 40
(d) 25, 50, 75

Answer: A

Question. The functional group present in organic, acid is –
(a) –COOH
(b) – OH
(c) – CHO
(d) > C = O

Answer: A

Question. Which of these contains the carbonyl group?
(a) all of these
(b) aldehydes
(c) ketones
(d) esters

Answer: A

Question. Butanone is a four-carbon compound with the functional group –
(a) ketone
(b) carboxylic acid
(c) aldehyde.
(d) alcohol.

Answer: A

Question. The functional group present in CH₃COOC₂H₅ is
(a) ester
(b) ketonic
(c) aldehydic
(d) carboxylic

Answer: A

Question. Which of the following compounds contains 1°, 2°, 3° as well as 4° carbon atoms ?
(a) 2,2,3-trimethyl pentane
(b) 2-methyl pentane
(c) Neopentane
(d) 2,3-dimethyl butane

Answer: A

Question. The number of secondary hydrogens in 2, 2-dimethylbutane is
(a) 2
(b) 6
(c) 8
(d) 4

Answer: A

Question. The compound which has one isopropyl group is
(a) 2- Methypentane
(b) 2, 2, 3- Trimethylpentane
(c) 2, 2 - Dimethylpentane
(d) 2, 2, 3, 3 - Tetramethylpentane

Answer: A

Question. Which of the following statements is false for isopentane ?
(a) It has a carbon which is not bonded to hydrogen
(b) It has one CH group
(c) It has one CH₂ group
(d) It has three CH₃ groups

Answer: A

Question. The number of primary, secondary and tertiary carbons in 3, 4-dimethylheptane are respectively
(a) 4, 3 and 2
(b) 4, 2 and 3
(c) 2, 3 and 4
(d) 3, 4 and 2

Answer: A

Question. The number of primary, secondary, tertiary and quaternary carbons in neopentane are respectively
(a) 4, 0, 0 and 1
(b) 4, 3, 2 and 1
(c) 5, 0, 0 and 1
(d) 4, 0, 1 and 1

Answer: A

Question. What is the IUPAC name of t-butyl alcohol
(a) 2–Methyl-propan–2-ol
(b) Propanol-2
(c) Butanol–2
(d) Butanol–1

Answer: A

Question. The IUPAC name of CH₃COCH (CH₃)₂ is -
(a) 3-methyl-2-butanone
(b) 4-methylisopropyl ketone
(c) 2-methyl-3-butanone
(d) isopropyl methyl ketone

Answer: A

Question. Which of the following statements is false for isopentane
(a) It has a carbon which is not bonded to hydrogen
(b) It has one CH group
(c) It has one CH₂ group
(d) It has three CH₃ groups

Answer: A

Question. The IUPAC name of the compound CH₃OCH₂CH₂CH₂OCH₂CH₃ is
(a) 3-ethoxy-1-methoxypropane
(b) 1-ethoxy-3-methoxypropane
(c) 2, 5-dioxyhexane
(d) ethoxypropane oxymethane

Answer: A

Question. IUPAC name of (CH₃)₃ CCl is
(a) 2-chloro-2-methylpropane
(b) 3-chloro butane
(c) 1-butyl chloride
(d) 2-butyl chloride

Answer: A

Question. The IUPAC name of neopentane is
(a) 2, 2-dimethylpropane
(b) 2, 2-dimethylbutane
(c) 2-methylpropane
(d) 2-methylbutane

Answer: A

Question. Total number of structural isomers possible for C₃H₆ are :
(a) 2
(b) 4
(c) 1
(d) 3

Answer: A

Question. An aromatic compound of formula C₇H₇Cl has in all ..... isomers
(a) 4
(b) 5
(c) 2
(d) 3

Answer: A

Question. CH₃CH₂OH and CH₃OCH₃ are the examples of
(a) functional isomerism
(b) metamerism
(c) chain isomerism
(d) position isomerism

Answer: A

Question. Which organic structure among the following is not an isomer of the compound CH₃–CO–CH₂CH₂CH₂CH₃ ?
(a) CH₃CH = CHCH₂CH₂CHO
(b) (CH₃)₂CH–CO–CH₂CH₃
(c) Both
(d) None of these

Answer: A

Question. The least number of carbon atoms in alkane showing isomerism is
(a) 4
(b) 1
(c) 3
(d) 2

Answer: A

Question. The number of possible alkynes with molecular formula C₅H₈ is
(a) 3
(b) 5
(c) 2
(d) 4

Answer: A

Question. The total number of isomers for C₄H₈ is
(a) 6
(b) 8
(c) 5
(d) 7

Answer: A

Question.  Which of the following compounds is isomeric with 2, 2, 4, 4- tetramethylhexane?
(a) 4-isopropylheptane
(b) 3-ethyl -2, 2- dimethylpentane
(c) 4-ethyl-3-methyl-4-n propyloctane
(d) 4, 4-diethyl-3-methylheptane

Answer: A

Question. Which are isomers ?
(a) ethyl alcohol and dimethyl ether
(b) acetone and acetaldehyde
(c) propionic acid and propanone
(d) methyl alcohol and dimethyl ether

Answer: A

Question. Methoxyethane and propanol are the examples of isomerism of the type
(a) functional
(b) structural
(c) position
(d) tautomerism

Answer: A

Question. Isomers of propionic acid are
(a) HCOOC₂H₅ and CH₃COOCH₃
(b) HCOOC₂H₅ and C₃H₇COOH
(c) CH₃COOCH₃ and C₃H₇OH
(d) None of these

Answer: A

Question. A functional isomer of 1-butyne is
(a) 1, 3-butadiene
(b) 1-butene
(c) 2-butyne
(d) 2-butene

Answer: A

Question. In which of the following, functional group isomerism is not possible?
(a) Alkyl halides
(b) Alcohols
(c) Aldehydes
(d) Cyanides

Answer: A

Question. The compounds CH₃CH == CHCH₃ and CH₃CH₂CH == CH₂
(a) are position isomers
(b) are tautomers
(c) exist together in dynamic equilibrium
(d) None of these

Answer: A

Question. Heterolytic fission of a covalent bond in organic molecules gives
(a) cations and anions
(b) only anions
(c) free radicals
(d) only cations

Answer: A

Question. Heterolytic fission of C – Br bond results in the formation of
(a) carbocation
(b) free radical
(c) carbanion
(d) None of these

Answer: A

Question. The organic reaction which proceed through heterolytic bond cleavage are called ________
(a) Both
(b) ionic
(c) polar
(d) None of these

Answer: A

Question. The shape of methyl carbanion is similar to that of –
(a) NH₃
(b) methyl carbocation
(c) BF₃
(d) methyl free radical

Answer: A

Question. The homolytic fission of a covalent bond liberates
(a) Free radicals
(b) Carbonium ions
(c) Carbanions
(d) Carbenes

Answer: A

Question. Homolytic fission of C–C bond in ethane gives an intermediate in which carbon is
(a) sp²-hybridised
(b) sp²d-hybridised
(c) sp-hybridised
(d) sp³-hybridised

Answer: A