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Organic Chemistry Mcqs

Q:

Identify the false statement regarding resonance.

A) As the number of charges increases, the resonance forms gets more significant B) Zero charge of resonance is the most significant one
C) Atoms with full octet resonance form are more stable when compared with the one with unfilled octet D) Resonance is unstable in case of unfilled octet of nitrogen atom
 
Answer & Explanation Answer: A) As the number of charges increases, the resonance forms gets more significant

Explanation: Greater the number of charges, less stable and less significant gets the resonance form.

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1699
Q:

Since the nuclei in a polyatomic molecule do not always vibrate in a simple harmonic manner, there arises which of the following situation?

A) Harmonicity B) Anharmonicity in molecular vibrations
C) Fundamental frequencies D) Infrared
 
Answer & Explanation Answer: A) Harmonicity

Explanation: Not available for this question

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1471
Q:

The distance between the centers of the peaks of doublet is called as?

A) Coupling constant B) Spin constant
C) Spin-spin coupling D) Chemical shift
 
Answer & Explanation Answer: A) Coupling constant

Explanation: Not available for this question

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1367
Q:

Which among the following is not a physical method?

A) X-ray fluorescence spectroscopy B) Atomic emission spectroscopy
C) Inert gas fusion D) Trace element analysis
 
Answer & Explanation Answer: C) Inert gas fusion

Explanation: Inert gas fusion is an example of chemical methods of quantitative analysis, as it involves chemical reaction such as oxidation.

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962
Q:

Which of the following instruments is used to measure the energy of the monochromatic radiation most accurately?

A) Photoelectric cell B) Thermopile
C) The potential detector D) The chemical actinometer
 
Answer & Explanation Answer: B) Thermopile

Explanation: A thermopile is an electronic device that converts thermal energy into electrical energy. It is composed of several thermocouples connected usually in series or, less commonly, in parallel.

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932
Q:

On which factors the vibrational stretching frequency of diatomic molecule depend?

A) Force constant B) Atomic population
C) Temperature D) Magnetic field
 
Answer & Explanation Answer: A) Force constant

Explanation: The value of vibrating stretching frequency is shifted if the force constant of a bond changes with its electronic structure. Frequency shifts also take place on working with the same substance in different states (solids, liquids and gas). A substance usually absorbs at higher frequency in a gaseous state as compared to liquid and solid states.

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864
Q:

Identify the incorrect statement regarding cycloalkenes.

A) The bonds in them are fewer compared to those in alkenes B) They occur in gaseous form in nature
C) These undergo polymerization D) The conjugated double bonds in them increase their stability
 
Answer & Explanation Answer: B) They occur in gaseous form in nature

Explanation: Cycloalkenes mostly appear in liquid state but sometimes they are even found in solid state.

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841
Q:

Primary amides get converted into primary amines by _________

A) Addition B) Oxidation
C) Reduction D) Acylation
 
Answer & Explanation Answer: B) Oxidation

Explanation: Primary amides upon heating in the presence of hydrogen and nickel catalyst, gets reduced to form primary amines.

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