Recommended PYQs (STRICTLY NCERT Based) Organic Chemistry - Some Basic Principles And Techniques Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Q1:

On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as :
1. Sublimation
2. Distillation
3. Chromatography
4. Crystallization

Subtopic: Qualitative Analysis of Organic Compounds |

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Q2:

Match List I with List II.

	List I (Molecule)		List II (Number and types of bond/s between two carbon atoms)
A.	Ethane	I.	$\small{\mathrm{One ~\sigma-bond~ and~ Two~ \pi-bonds}}$
B.	Ethene	II.	$\text { Two } \pi \text {-bonds }$
C.	Carbon molecule, $\mathrm{C} _2$	III.	$\text { One } \sigma \text {-bond }$
D.	Ethyne	IV.	$\small{\mathrm{One ~\sigma-bond ~and ~One~ \pi-bond}}$

Choose the correct answer from the options given below:

1. A-IV, B-III, C-II, D-I
2. A-III, B-IV, C-II, D-I
3. A-III, B-IV, C-I, D-II
4. A-I, B-IV, C-II, D-III

Subtopic: Hybridisation & Structure of Carbon Compounds |

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Q3:

Determine the IUPAC name of the compound with the molecular formula C₆H₁₄ that contains two tertiary carbon atoms.

1. 2-Methyl pentane
2. 2, 3-Dimethylbutane
3. 2, 2-Dimethylbutane
4. n-Hexane

Subtopic: Nomenclature |

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Q4:

The most stable carbocation among the following is:

1.
2.
3.
4.

Subtopic: Reaction Intermediates ; Preparation & Properties |

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Q5:

The method used for quantitative estimation of halogens is:
1. Dumas method
2. Carius method
3. Kjeldahl's method
4. Combustion method

Subtopic: Qualitative Analysis of Organic Compounds |

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Q6:

The technique used to purify liquids having high boiling points and getting decomposed at or below their boiling points is:

1. Fractional distillation
2. Steam distillation
3. Simple distillation
4. Distillation under reduced pressure

Subtopic: Qualitative Analysis of Organic Compounds |

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Q7:

The compound that gives blood red colour in Lassaigne's test is:

1.		2.
3.		4.

Subtopic: Qualitative Analysis of Organic Compounds |

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Q8:

Which of the following options is the correct IUPAC name for the given compound?

1. 4-Ethyl-1-fluoro-2-nitrobenzene
2. 4-Ethyl-1-fluoro-6-nitrobenzene
3. 3-Ethyl-6-fluoro-1-nitrobenzene
4. 1-Ethyl-4-fluoro-3-nitrobenzene

Subtopic: Nomenclature |

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Q9:

A steam volatile organic compound which is immiscible with water has a boiling point of

250^{\circ} C

$250^\circ \text{C}$ . During steam distillation, a mixture of this organic compound and water will boil:

1. Above

100^{\circ} C

$100^\circ \text{C}$ but below

250^{\circ} C

$250^\circ \text{C}$ .
2. Above

250^{\circ} C

$250^\circ \text{C}$ .
3. At

250^{\circ} C

$250^\circ \text{C}$ .
4. Close to but below

100^{\circ} C

$100^\circ \text{C}$ .

Subtopic: Qualitative Analysis of Organic Compounds |

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Q10:

On complete combustion,

0.3 g

$0.3 \mathrm{~g}$ of an organic compound gave

0.2 g

$0.2 \mathrm{~g}$ of

{C O}_{2} a n d 0.1 g

$\mathrm{CO}_2~ \mathrm{and}~ 0.1 \mathrm{~g}$ of

H_{2} O

$\mathrm{H}_2 \mathrm{O}$ . The percentage composition of carbon and hydrogen in the compound, respectively is:
1.

4.07 % a n d 15.02 %

$4.07 \% ~\mathrm{and}~ 15.02 \%$
2.

18.18 % a n d 3.70 %

$18.18 \% ~\mathrm{and}~ 3.70 \%$
3.

15.02 % a n d 4.07 %

$15.02 \% ~\mathrm{and}~ 4.07 \%$
4.

3.70 % a n d 18.18 %

$3.70 \% ~\mathrm{and}~ 18.18 \%$

Subtopic: Quantitative Analysis of Organic Compounds |

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