Organic Chemistry Some Basic Principles CBSE Questions & Answers

Organic Chemistry Some Basic Principles

This is Chemistry Class 11 Organic Chemistry Some Basic Principles CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Electrophiles are electron seeking species. Which of the following groups contain only electrophiles? (i) \({\text{B}}{{\text{F}}_{\text{3}}},{\text{ N}}{{\text{H}}_{\text{3}}},{\text{ }}{{\text{H}}_{\text{2}}}{\text{O}}\) (ii) \(AlCl3,,SO3,No_2^ + \)(iii) \({\text{No}}_2^ + ,{\text{C}}{{\text{H}}_{\text{3}}}^ + ,{\text{C}}{{\text{H}}_{\text{3}}} - \mathop C\limits^ + = {\text{O}}\) (iv) \({{\text{C}}_{\text{2}}}{\text{H}}_5^ + ,{\mathop C\limits^ + _{\text{2}}}{{\text{H}}_{\text{5}}},{{\text{C}}_{\text{2}}}{\text{H}}_5^ + \)
  • A
    (i) and (iv)
  • B
    (i) and (ii)
  • C
    (i) and (iii)
  • D
    (ii) and (iii)
    Correct
2
In the four compounds below, which of the following pairs are position isomers? (i) I and II (ii) II and III(iii) II and IV(iv) III and IV
Question 2 figure 1
  • A
    I
  • B
    IV
  • C
    III
  • D
    II
    Correct
3
In Carius method, the organic compound is heated with
  • A
    Phosphoric acid
  • B
    Iodine pentoxide
  • C
    fuming nitric acid
    Correct
  • D
    conc. sulphuric acid
4
Write the state of hybridisation of carbon in the compound, HC\( \equiv \)N and shapes of each of the molecules
  • A
    \({\text{s}}{{\text{p}}^{\text{2}}}\)hybridised carbon, trigonal planar
  • B
    sp hybridised carbon, linear
    Correct
  • C
    \({\text{s}}{{\text{p}}^{\text{3}}}\)hybridised carbon, tetrahedral
  • D
    \({\text{s}}{{\text{p}}^{\text{2}}}\) hybridised carbon, trigonal
5
In sulphur estimation, 0.157 g of an organic compound gave 0.4813 g of barium sulphate. What is the percentage of sulphur in the compound?
  • A
    \({\text{11 }}\% \)
  • B
    \({\text{42}}.{\text{1}}0\% \)
    Correct
  • C
    \({\text{41}}.{\text{6 }}\% \)
  • D
    \({\text{24 }}\% \)
6
During estimation of nitrogen present in an organic compound by Kjeldahl’s method, the ammonia evolved from 0.5 g of the compound, neutralized 10 mL of 1 M \({{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}.\)Find out the percentage of nitrogen in the compound.
  • A
    \({\text{46}}\% \)
  • B
    \({\text{51}}\% \)
  • C
    \({\text{56 }}\% \)
    Correct
  • D
    \({\text{42 }}\% \)
7
Which of the following is the correct IUPAC name?
  • A
    5-Ethyl-4, 4-dimethylheptane
  • B
    4, 4-Bis(methyl)-3-ethylheptane
  • C
    3-Ethyl-4, 4-dimethylheptane
  • D
    4, 4-Dimethyl-3-ethylheptane
    Correct
8
When inductive and electromeric effects operate in opposite directions, what happens?
  • A
    the inductive effect predominates
  • B
    resonance structures are formed
  • C
    inductive and electromeric effects operate with the same magnitude
  • D
    the electomeric effect predominates
    Correct
9
What does the following diagram showing Lewis structures depict?
Question 9 figure 1
  • A
    metamerism in nitromethane \(\left( {{\text{C}}{{\text{H}}_{\text{3}}}{\text{N}}{{\text{O}}_{\text{2}}}} \right)\)
  • B
    inductive effect in nitromethane \(\left( {{\text{C}}{{\text{H}}_{\text{3}}}{\text{N}}{{\text{O}}_{\text{2}}}} \right)\)
  • C
    resonance structures of nitromethane \(\left( {{\text{C}}{{\text{H}}_{\text{3}}}{\text{N}}{{\text{O}}_{\text{2}}}} \right)\)
    Correct
  • D
    electron displacement effects in nitromethane \(\left( {{\text{C}}{{\text{H}}_{\text{3}}}{\text{N}}{{\text{O}}_{\text{2}}}} \right)\)
10
Nucleophile is a species that should have:
  • A
    a pair of electrons to donate
    Correct
  • B
    neutral charge
  • C
    electron deficient species
  • D
    positive charge
11
In Carius method of estimation of halogen, 0.15 g of an organic compound gave 0.12 g of AgBr. Find out the percentage of bromine in the compound.
  • A
    \({\text{34}}.0{\text{4}}\% \)
    Correct
  • B
    \({\text{24 }}\% \)
  • C
    \({\text{41}}.{\text{5}}\% \)
  • D
    \({\text{41}}.{\text{6 }}\% \)
12
In Dumas’ method for estimation of nitrogen, 0.3g of an organic compound gave 50mL of nitrogen collected at 300K temperature and 715mm pressure.Calculate the percentage composition of nitrogen in the compound. (Aqueoustension at 300K=15 mm)
  • A
    \({\text{17}}.{\text{46}}\% \)
    Correct
  • B
    \({\text{24 }}\% \)
  • C
    \({\text{21}}.{\text{6 }}\% \)
  • D
    \({\text{11}}.{\text{5}}\% \)
13
On complete combustion, 0.246 g of an organic compound gave 0.198g of carbon dioxide and 0.1014g of water. Determine the percentage composition of carbon and hydrogen in the compound.
  • A
    \({\text{34}}.0{\text{4}}\% {\text{ and 4}}.{\text{58}}\% \)
  • B
    \({\text{11}}.{\text{95}}\% {\text{and 3}}.{\text{65}}\% \)
  • C
    \({\text{31}}.{\text{95}}\% {\text{ and 4}}.{\text{58}}\% \)
  • D
    \({\text{21}}.{\text{95}}\% {\text{ and 4}}.{\text{58}}\% \)
    Correct
14
One among the below options is not detected by Lassaigne’s test”which is used fo detecting the following present in an organic compound.
  • A
    Nitrogen
  • B
    sulphur
  • C
    oxygen
    Correct
  • D
    phosphorus
15
In the resonance structures of \({\text{C}}{{\text{H}}_{\text{2}}} = {\text{CH}} - {\text{CHO}}\) given below, indicate relative stability of these structures.
Question 15 figure 1
  • A
    I > II> III
    Correct
  • B
    II> III > I
  • C
    III>II>I
  • D
    III > I > II