NEET Chemistry Organic Chemistry Some Basic Principles and Techniques MCQs Set C

Question: Names of some compounds are given. Which one is not correct in IUPAC system ?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: The best method for the separation of naphthalene and benzoic acid from their mixture is

• a) Chromatography
• b) Crystallisation
• c) Distillation
• d) Sublimation

Answer: Sublimation

Question:  The correct order of increasing bond length of C – H, C – O, C – C and C = C is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  Homolytic fission of the following alkanes forms free radicals CH₃– CH₃, CH₃– CH₂– CH₃, (CH₃)₂CH – CH₃,CH₃– CH₂– CH (CH₃)₂. Increasing order of stability of the radicals is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?

• a) Fe₃[Fe(CN)₆]₃
• b) Fe₃[Fe(CN)₆]₂
• c) Fe₄[Fe(CN)₆]₃
• d) Fe₄[Fe(CN)₆]₂

Answer: Fe₄[Fe(CN)₆]₃

Question: Which one is a nucleophilic substitution reaction among the following?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  For the given alkane

The IUPAC name is

• a) 1, 1 dimethyl-5-ethyloctane
• b) 6-ethyl-2-methylnonane
• c) 4-ethyl-8-methylnonane
• d) 2-methyl, -6-propyloctane

Answer: 6-ethyl-2-methylnonane

Question: Most stable carbocation is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  Lowest pK_a is associated with

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which of the following chemical system is non-aromatic?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:   Arrange the following in increasing order of stability.

• a) e < d < c < b < a
• b) e < d < c < a < b
• c) d < e < c < a < b
• d) a < e < d < c < b

Answer: e < d < c < a < b

Question: An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H,9.67%. The empirical formula of the compound would be

• a) CH₄O
• b) CH₃O
• c) CH₂O  
• d) CHO

Answer: CH₃O

Question: The most suitable method of the separation of a 1 : 1 mixture of ortho-and para-nitrophenols is

• a) Crystallization
• b) Chromatography
• c) Steam distillation
• d) Sublimation

Answer: Steam distillation

Question:

The IUPAC name for 

• a) 3-amino hept-5-enoic acid
• b) β-amino δ–heptenoic acidx
• c) 5-amino 2-heptenoic acid 
• d) 5-amino hex-2-ene-carboxylic acid

Answer: 3-amino hept-5-enoic acid

Question:  The number of structural isomers in C₄H₁₀O will be

• a) 7
• b) 8
• c) 5
• d) 6

Answer: 7

Question:  The IUPAC name of (CH₃)₂CH–CH₂–CH₂Br is

• a) 1-bromo-3-methyl butane
• b) 2-methyl-3-bromo propane
• c) 1-bromo pentane
• d) 2-methyl and 4-bromo butane

Answer: 1-bromo-3-methyl butane

Question:  Among the following compounds (I-III) the correct order of rate of electrophillic substitution is

• a) I > II > III
• b) I = II > III
• c) II > III > I
• d) III < I < II

Answer: I > II > III

Question: Tautomerism is exhibited by

• a) R₃CNO₂ 
• b) RCH₂NO₂
• c) (CH₃)₃CNO 
• d) (CH₃)₂NH

Answer: RCH₂NO₂

Question: Which one of the following compounds will be most easily attacked by an electrophile?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

More Questions.......................................

Question: Which one of the following orders is correct regarding the –I effect of the substituents?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  Increasing order of electrophilic substitution for following compounds

• a) IV < I < II < III
• b) III < II < I < IV
• c) I < IV < III < II
• d) II < III < I < IV

Answer: IV < I < II < III

Question: The incorrect IUPAC name is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  IUPAC name of the following is

• a) 1, 5-hexenyne
• b) 1-hexene-5-yne
• c) 1-hexyne-5-ene
• d) 1, 5-hexynene

Answer: 1-hexene-5-yne

Question:

are

• a) Resonating structures
• b) Tautomers
• c) Geometrical isomers
• d) Optical isomers

Answer: Resonating structures

Question:  Name of the compound given below is

• a) 4-ethyl-3-methyloctane
• b) 3-methyl-4-ethyloctane
• c) 2, 3-diethylheptane
• d) 5-ethyl-6-methyloctane

Answer: 4-ethyl-3-methyloctane

Question:  The molecular formula of diphenyl methane,  is C₁₃H₁₂ . How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom?

• a) 6
• b) 4
• c) 8
• d) 7

Answer: 4

Question:  The number of structural isomers in C₄H₁₀O will be

• a) 7
• b) 8
• c) 5
• d) 6

Answer: 7

Question: The best method for the separation of naphthalene and benzoic acid from their mixture is

• a) Chromatography
• b) Crystallisation
• c) Distillation
• d) Sublimation

Answer: Sublimation

Question:  What is the hybridisation state of benzyl carbonium ion 

• a) sp³
• b) sp²
• c) spd²
• d) sp²d

Answer: sp²

Question: Which of the following compounds will exhibit cis-trans (geometrical) isomerism?

• a) Butanol
• b) 2-Butyne
• c) 2-Butenol
• d) 2-Butene

Answer: 2-Butene