List of top NanoScience Questions on Organic Chemistry

Which of the following conditions should be met while writing the canonical structures of a resonance hybrid ?
A. The magnitude of resonance energy should be low and the hybrid will be more stable
B. The number of unpaired electrons should be same in all the canonical forms
C. Canonical forms where similar charges develop on vicinal atoms are highly significant forms
D. The positions of the nuclei of each canonical form and the hybrid must remain same
E. Only a pair of electrons should be shifted in writing the canonical forms
Choose the correct answer from the options given below :

Which of the following compounds have chiral carbon ?
A. 1, 1-Dibromopentane
B. 2-Chloro-2-methylpropane
C. 2-Bromopentane
D. 3-Bromopentane
E. 1-fluoro-2-ethylpentane
Choose the correct answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : $\dot{C}H_3$ behave as nucleophiles.
Reason (R) : Odd electron species where unpaired electron is accommodated in a low energy SOMO also behave as nucleophiles.
In the light of the above statements, choose the most appropriate answer from the options given below :

The correct order of nucleophilicity (nucleophilic reactivity) of the given species is :
A. $EtO^-$
B. $Me_3N$
C. $CN^-$
D. $OH^-$
E. $PhO^-$
Choose the correct answer from the options given below :

Predict the % product formation in the given reaction :
$CH_3CH_2CBr(CH_3)_2 \xrightarrow{KOH(alc.)} CH_3CH=C(CH_3)_2 \ (X) + CH_3CH_2C(CH_3)=CH_2 \ (Y)$}

The Carbon atom in singlet and triplet carbene is ____________ and ____________ - hybridized, respectively.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Diastereomers are achiral molecules have superposable mirror images.
Reason (R) : Diastereomers are compounds have different physical properties.
In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Boiling point of cis isomers is higher than trans isomers.
Reason (R) : The Dipole moment of cis isomers is higher than trans isomers.
In the light of the above statements, choose the most appropriate answer from the options given below :

Strongest acid among the following is:

Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para compounds. The reaction is:

Among the following molecules, the one with the highest dipole moment is:

Which of the following will give benzoic acid on acidic hydrolysis:
(A) Phenyl cyanide,
(B) Benzonitrile,
(C) Benzyl cyanide,
(D) Methyl benzoate

The process of vulcanization makes rubber:
(A) Soluble in water,
(B) Elastic,
(C) Hard,
(D) Durable

Arrange the following in decreasing order of nucleophilicity:
(A). H₂O
(B). NH₃
(C). OH⁻
(D). NH₂−
Choose the correct answer from the options given below: