Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 8

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Question 1
1 / -0

In Carius method, the organic compound is heated with

A
conc. sulphuric acid

B
iodine pentoxide

C
phosphoric acid

D
fuming nitric acid

Solution

In carius method of estimation of halogens, aknown mass of an organic compound is heated with fuming nitric acid in the presence of silver nitrate contained in a hard glass tube known as Carius tube, in a furnace.
Question 2
1 / -0

Write the state of hybridisation of carbon in the compound, HC ≡ N and shape of the molecule.

A
sp hybridised carbon, linear

B
sp²hybridised carbon, trigonal planar

C
sp³hybridised carbon, tetrahedral

D
sp³ hybridised carbon, trigonal pyramidal

Solution

As the C is bonded to N by a triple bond so it is sp hybridized andand the molecule is linear in shape.
Question 3
1 / -0

When inductive and electromeric effects operate in opposite directions, what happens?

A
the electomeric effect predominates

B
the inductive effect predominates

C
inductive and electromeric effects operate with the same magnitude

D
resonance structures are formed

Solution

Electromeric Effect (E effect) is a temporary effect. The organic compounds having a multiple bond (a double or triple bond) show this effect in the presence of an attacking reagent only. It is defined as the complete transfer of a shared pair of π-electrons to one of the atoms joined by a multiple bond on the demand of an attacking reagent. Polarisation of σ-bond caused by the polarisation of adjacent σ-bond is referred to as the inductive effect. When inductive and electromeric effects operate in opposite directions then electomeric effect predominates.
Question 4
1 / -0

Nucleophile is a species that should have:

A
electron deficiency

B
positive charge

C
a pair of electrons to donate

D
capacity to accept electrons

Solution

A nucleophile means a nucleus loving species. It can be a neutral molecule with a pair of electron to donate or it can be a negatively charged species.