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Spectroscopic identification of organic compounds - class-XI

Description: spectroscopic identification of organic compounds
Number of Questions: 19
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Tags: introduction to analytical chemistry measurement and data processing and analysis chemistry materials
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Joining of monomers to form polymers is called as :

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. polymerization

  2. hydrolysis

  3. condensation

  4. none of the above

Show answer
Correct Option: A
Explanation:

Polymerization is the process of combining many small molecules known as monomers into a covalently bonded chain or network. 


During the polymerization process, some chemical groups may be lost from each monomer. 

The distinct piece of each monomer that is incorporated into the polymer is known as a repeat unit or monomer residue.

Hence the correct option is A.

Analytical chemistry deals with:

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. experimental study by qualitative means.

  2. experimental studies by quantitative means.

  3. experimental studies both by qualitative and quantitative means.

  4. None of the above

Show answer
Correct Option: C
Explanation:

Analytical chemistry deals with experimental studies both by qualitative and quantitative means. Hence, option C is correct. 

The acidic strength of methoxyphenols are in order

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. Para > Ortho > Meta > Phenol

  2. Para > Ortho > Phenol > Meta

  3. Meta > Phenol > Ortho > Para

  4. Meta > Phenol > Para > Ortho

Show answer
Correct Option: B

Consider the following reagents
I. ${Br} _{2}$ water  II. Tollen's reagent
III. Fehling's solution which cannot be used to make distinction between an aldose and a ketose?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. I, II and III

  2. II and III

  3. I only

  4. II only

Show answer
Correct Option: C

Analytical chemistry deals with experimental study both by :

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. qualitative means

  2. quantitative means

  3. Both A and B

  4. None of the above

Show answer
Correct Option: C
Explanation:

Analytical chemistry deals with experimental study both by qualitative and quantitative means.

The correct order of the solubility of the different alcohols in water is

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. n-propyl alcohol > ethyl alcohol >n-butyl alcohol

  2. Ethyl alcohol>n-butyl alcohol>n-propyl alcohol

  3. n-butyl alcohol>n-propyl alcohol>ethyl alcohol

  4. Ethanol>n-propanol>n-butyl alcohol

Show answer
Correct Option: B

Which of the following is not a nucleophile :

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. $CH _3O^-$

  2. $H _2O$

  3. $CH _3-OCH _3$

  4. $CH _3-\underset{H}{\underset{|}{\overset{+}{O}}} - H$

Show answer
Correct Option: D
Explanation:

Nucleophile are electron rich species, can donate their electron SO, $CH _3-\underset{H}{\underset{|}{\overset{+}{O}}} - H$ is not a Nucleophile.

What is Analytical chemistry?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. The study of the separation, identification, and quantification of the chemical components of natural and artificial materials.

  2. The study of the chemical composition and structure of substances.

  3. The study of the only separation of the chemical components of natural and artificial materials.

  4. The study of the only identification of the chemical components of natural and artificial materials.

Show answer
Correct Option: A
Explanation:

Analytical chemistry is the study of the separation, identification, and quantification of the chemical components of natural and artificial materials.

Hence, option A is correct.

How many polypeptide chains are there in 1 $Hb$ molecule?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. $2\alpha $ and $2\beta$

  2. $4\alpha$

  3. $4\beta$

  4. $1\alpha $ and $3\beta$

Show answer
Correct Option: A
Explanation:

1 Hb molecule have $2\alpha$ + $2\beta$ polypeptide chains.

Find the odd one out.

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. Wool

  2. Polyester

  3. Silk

  4. Cotton

Show answer
Correct Option: B
Explanation:

Polyester is synthetic polymer. Wool, silk and cotton are natural polymers.

Borax bead test is given by:

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. $Na{NO} _{3}$

  2. $Fe{SO} _{4}$

  3. $Cu{SO} _{4}$

  4. ${NH} _{4}Cl$

Show answer
Correct Option: C
Explanation:

Borax bead test is given by $CuSO _{4}$, hence, option C is correct.

Which of the following fact(s) explain(s) as to why p-
nitrophenol is more acidic than phenol?
I. - I Effect of nitro group.
II. Greater resonance effect of $p$ -nitrophenoxy group
II. Steric effect of bulky nitro group

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. I and II

  2. I and III

  3. II and III

  4. II alone

Show answer
Correct Option: A
Explanation:
P nitrophenol is stronger acid than phenol
The nitro-group is an electron-withdrawing group. The presence of this group in the ortho or para position decreases the electron density in the OH bond. As a result, it is easier to lose a proton. ... Hence, ortho and para nitrophenols are stronger acids than phenol.

Equimolar mixture of a $\alpha-D(+)$- glucose and $\beta-D(+)$-glucose has specific rotation (${[\alpha]} _{D}$) is:

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. $-{92.4}^{o}$

  2. $+{112.5}^{o}$

  3. $+{52.5}^{o}$

  4. $-{19.2}^{o}$

Show answer
Correct Option: C
Explanation:
The specific rotation of α-D-glucopyranose decreases from +112° to +52.5°.
The specific rotation of β-D-glucopyranose increases from +19° to +52.5°.
The specific rotation of equimolar mixture of  $\alpha$ - D(+) - glucose and $\beta$ - D(+) - glucose has a specific rotation $52.5^0$.

Hence, the correct option is C.

When does a precipitate form?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. When something is insoluble in solution.

  2. When something is soluble in solution.

  3. When too much of a substance is added to solution.

  4. Whenever a solid is added to solution.

  5. Whenever liquid is added to a solution.

Show answer
Correct Option: C
Explanation:

When too much of a substance is added to solution, a precipitate forms.
Also, when ionic product exceeds solubility product, the precipitation occurs.
In a supersaturated solution, the excess ions recombine to form solid which results in precipitation.

What is a macromolecule?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. A huge molecule made up of smaller sub units called monomers

  2. A huge molecule made up of smaller sub units called polymers

  3. A huge molecule found only in living things

  4. A huge molecule that contains carbon

  5. A molecule made of larger subpieces

Show answer
Correct Option: B
Explanation:

A macromolecule is a term used to contrast a micromolecule (which is smaller in size and in molecular weight). Macromolecules are usually used to refer to large biological polymers, such as nucleic acids and proteins, which are made up of small monomers linked together.

Which of the following method is the fastest and most cost-efficient method for determining the order of the reaction involved in the laboratory?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. Mass spectrometry

  2. Spectrophotometry

  3. Titration

  4. Paper chromatography

Show answer
Correct Option: A
Explanation:

Mass spectrometry (MS) is an analytical technique that measures the mass-to-charge ratio of ions. The results are typically presented as a mass spectrum, a plot of intensity as a function of the mass-to-charge ratio.It helps in calculating order of reaction.

Which of the following anions neutralize the acidic pH of the chime that enters into the duodenum from the stomach?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. $H _2PO^- _4$

  2. $HSO^- _4$

  3. $HCO^- _3$

  4. $CH _3COO^-$

Show answer
Correct Option: C
Explanation:

$HCO _3$ which is produced by the duct cells helps in neutralizing the acidic chime. It creates an optimum pH for the digestive enzymes in the duodenum.

Which organic macromolecule is responsible for genetic information?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. Nucleic Acid

  2. Protein

  3. Nucleus

  4. Lipid

  5. Carbohydrate

Show answer
Correct Option: A
Explanation:

Nucleic acid are the organic molecules responsible for genetic information.
Organic Macro-molecules: Organic compounds are those that contain carbon (e.g. carbohydrates, lipids, proteins, nucleic acids).

What is the coordination number of body centred cube?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. 8

  2. 6

  3. 4

  4. 12

Show answer
Correct Option: A
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