Nomenclature & Isomerism Test

Result

Nomenclature & Isomerism Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

The false statement among the following is

A
The value of specific rotation of a molecule can be deduced from its structure

B
The sign of specific rotation of a molecule can be deduced from its structure

C
Both of the above

D
None of the two

Solution

Both the sign and value of observed rotation and hence specific rotation can be ascertained only by experiments, although, we can ascertain the absolute configuration (R or S) from the given structure. The sign of rotation is a molecular property unrelated to configuration.
Question 2
1 / -0

Directing influence of the methyl group can be explained on the basis of

A
resonance effect

B
no-bond resonance

C
inductive effect

D
electromeric effect

Solution

Methyl group can't produce electromeric and resonance effects. Inductive effect affects all the three positions of the ring in decreasing order of ortho > meta > para. It shows hyperconjugation (no-bond resonance) which explains beautifully the o, p-directing influence of the -CH₃ group.
Question 3
1 / -0

Which of the following are isoelectronic?

A
HC≡CH and HCN

B
CH₃CH₂CN and CH₃C ≡ CCH₃

C
Both

D
None

Solution

The number of electrons in the two compounds of each pair is equivalent.