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Chemistry Class 12th

The number of stereoisomers possible for 1,2-dimethyl cyclopropane is

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alok kumar singh

Contributor-Level 10

Following are the possible isomers of 1, 2-dimethyl cyclopropane

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Chemistry Chemistry Hydrocarbon

Which one of the following compounds is not aromatic?

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alok kumar singh

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Chemistry Class 11th

The polymer formed on heating Novolac with formaldehyde is:

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Chemistry Class 12th

Consider the given reaction, Identify 'X' and 'Y'

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alok kumar singh

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Chemistry Class 12th

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alok kumar singh

Contributor-Level 10

Chlordiazepoxide is an example of tranquilizer.

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Chemistry Chemistry Coordination Compounds

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value.

Complexes: ${[C o F_{6}]}^{3 -}, {[C o {(H_{2} O)}_{6}]}^{2 +}, {[C o {(N H_{3})}_{6}]}^{3 +} a n d {[C o {(e n)}_{3}]}^{3 +}$

A B C &nbs

...more

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value.

Complexes: ${[C o F_{6}]}^{3 -}, {[C o {(H_{2} O)}_{6}]}^{2 +}, {[C o {(N H_{3})}_{6}]}^{3 +} a n d {[C o {(e n)}_{3}]}^{3 +}$

A B C D

Choose the correct option:

less

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alok kumar singh

Contributor-Level 10

CFSE $\propto$ strength of ligand

And order of strength of ligand is

en > NH₃ > H₂O > F^-

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Chemistry Biomolecules

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Sucrose is a disaccharide and a non-reducing sugar.

Reason (R): Sucrose involves glycosidic linkage between C₁ of b-glucose and C₂ of a-fructose.

Choose the most appropriate answer from the options given below:

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alok kumar singh

Contributor-Level 10

Sucrose is the disaccharides which is a non-reducing sugar, but if forms glycosidic linkage between C₁ of a - glucose and C₂ of b-fructose. Hence Assertion is correct, but Reason is incorrect.

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Chemistry Class 12th

Which one for the following phenols does not give colour when condensed with phthalic anhydride in presence of conc. H₂SO₄?

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alok kumar singh

Contributor-Level 10

In given following phenol and its derivaties only para-methyl phenol does not produce any colour with phthalic anhydride in the presence of conc. H₂SO₄.

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Chemistry Class 12th

The interaction energy of London forces between two particles is proportional to r^x, where r is the distance between the particles. The value of x is:

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alok kumar singh

Contributor-Level 10

The interaction energy of London forces ; $E \propto \frac{1}{r^{6}} o r E \propto r^{- 6}$ . Hence x = -6.

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Chemistry Class 11th

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Barium carbonate is insoluble in water and is highly stable.

Reason (R): The thermal stability of the carbonates increases with increasing cationic size.

Choose the most appropriate answer from the options given below:

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alok kumar singh

Contributor-Level 10

In alkaline earth metals cationic size increases down the groups, hence thermal stability of carbonates increases down the group. Therefore both assertion and reason are correct and reason is correct explanation of assertion.

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