Home
Class 12
CHEMISTRY
Assertion : Fullerenes are the only pure...

Assertion : Fullerenes are the only pure form of carbon.
Reason : It contains twenty, five membered rings and twelve, six membered rings.

A

Interlocking of hexagonal carbon rings

B

Interlocking of pentagonal carbon rings

C

Interlocking of hexagonal and pentagonal carbon rings

D

Interlocking of hexagonal and heptagonal carbon rings

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • THE P-BLOCK ELEMENTS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment Section-B)|26 Videos
  • THE P-BLOCK ELEMENTS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment Section-C)|23 Videos
  • THE P-BLOCK ELEMENTS

    AAKASH INSTITUTE ENGLISH|Exercise Try yourself|70 Videos
  • THE D AND F-BLOCK ELEMENTS

    AAKASH INSTITUTE ENGLISH|Exercise Assingment ( Section-J Aakash Challengers Questions )|10 Videos
  • THE S-BLOCK ELEMENTS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-J)|10 Videos

Similar Questions

Explore conceptually related problems

C_(60) contains 'x' five membered rings & 'y' six memebered Then :

How many of the following statements are correct regarding allotropes of carbon: (a) Graphite is not a good conductor of electicity in perpendicular direction of layers at ordinary temperatures. (b) Coke is the impure form of carbon. ( c) Anthracite is the purest form of carbon. (d) Buckminister fullerence contains 12 five membered rings and 20 six-membered rings. (e) Diamond is a good conductor of heat. (f) Graphite is diamagnetic in nature. (g) Graphite is thermodynamically more stable than diamond

Assertion :- Physical adsorption forms multimolecular layer. Reason :- It contains covalent bond.

Assertion (A) : C_(60) fullerence is an allotrope if carbon. Reason (R) :In C_(60) fullerene , five -menmebrd rings are isolated forem each other .

Intramolecular aldol condensation : The aldol condensation also offer a convenient way to synthesize molecules with five and six membered ring.This can be done by an intramolecular aldol condensation using a dialdehyde, a keto aldehyde or a diketone as the substrate.The major product is formed by the attack of the enolate from the ketone side of the molecule that adds to the aldehyde group.The reason the aldehyde group undergoes addition preferentially may arise from the greater reactivity of aldehyde towards nucleophilic addition.In reaction of this type five membered rings from far more readily than seven membered rings and six membered rings are more favourable than four or eight membered rings when possible. 1-Etylcyclopent-1-ene on reductive ozonolysis followed by aq. NaOH//Delta gives

Intramolecular aldol condensation : The aldol condensation also offer a convenient way to synthesize molecules with five and six membered ring.This can be done by an intramolecular aldol condensation using a dialdehyde, a keto aldehyde or a diketone as the substrate.The major product is formed by the attack of the enolate from the ketone side of the molecule that adds to the aldehyde group.The reason the aldehyde group undergoes addition preferentially may arise from the greater reactivity of aldehyde towards nucleophilic addition.In reaction of this type five membered rings from far more readily than seven membered rings and six membered rings are more favourable than four or eight membered rings when possible. The true statement about the major product of CH_3-oversetOoverset(||)C-CH_2-CH_2-CH_2-CH_2-oversetoverset(O)(||)C-H in reaction with aq.NaOH followed by heating is.

Assertion : Annual rings are used to calculate the age of tree. Reason : Secondary growth is not found in Bamboo

Assertion: Dark reaction is purely enzymatic reaction. Reason: It occurs only in absence of light.

Assertion : The field strength at the centre of a ring is zero Reason : At the centre of the ring, slope of V-r graph is zero.\

Unlike most hydrocarbons, azulene (C_(10)H_(8)) is highly coloured (deep blue), although its is omer, nephthalene does not have significant zwitter-ionic character , azulene does. (i) Draw a reasonance structure of azulene in which five-membered ring is anionic and the seven-membered ring cationic. (ii) Can azulene be considered aromatic ?