Organic Chemistry

A hybrid orbital has 25% s-character and 75% p-character .To which type of hybridization it belongs to?

Correct! Wrong!

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In sp3 hybridization, s-character is 25% and p-character is 75%.

Hyperconjugation is ____.

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Hyperconjugation is the delocalisation of σ electrons into a nearby empty orbital.

Vital force theory was propounded by ___________.

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Berzelius propounded in 1825 that organic compounds are influenced by a mysterious force by which they are formed in nature. This is called the vital force theory. However, the theory met a blow and was not accepted. In 1828, Wohler prepared the compound urea, by treating ammonium chloride with potassium thiocyanate. In 1845, Herman Kolbe prepared acetic acid in the lab. In 1856, Berthelol prepared methane.

Of the compounds given, _____ has only one type of hybrid carbon.

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Of the compounds given, CH3 - CH2 - CH2 - CH3 has only one type of hybrid carbon. In option A, we have sp3 and sp2 hybrid carbon atoms. In Option B, we have sp and sp3 hybrid carbon atoms. In option C, we have sp3 and sp carbon atoms

Of the given compounds which is vinyl carbinol?

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Methanol (CH3−OH) is known as Carbinol, and the Vinyl group is −CH = CH2. Thus the vinyl carbinol is HO−CH2−CH = CH2 the compound which has the vinyl group is therefore Option C. Others do not have this group. For vinyl group Methylene group should be the terminal carbon.

The principle involved in paper chromatography is

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Without hint.

The functional groups in the compound, H3C - CHOH - CH2 - CHNH2 - CH2 COOH are ______________ .

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The compound contains hydroxy (-OH), amino (-NH2) and carboxylic (-COOH) functional groups.

As s-character in hybrid orbital increases, the bond length ____ and bond strength ____.

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Greater is the s-character, closer is the orbital and nucleus and hence, higher is the electro negativity of that carbon. This shortens the carbon to carbon bond length and increase bond strength.

____ method helps to purify naphthalene.

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Sublimation method helps to purify naphthalene. The process of sublimation involves the direct conversion of a solid into the gaseous state, on heating, without passing through the intervening liquid state and vice-versa, on cooling. The process of sublimation is very useful in the purification of such solids which sublime on heating and are associated with non-volatile impurities.

Which of the following is not a nucleophile?

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BF3 has electron deficient B, hence it is an electrophile.

Tetra hydro furan is classified as ____

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Tetra hydro furan is a hetero cyclic compound because it has a ring with carbon atoms. It also has oxygen in the ring. Alicyclic compounds are those which contain the same atoms in the ring. Aromatic compounds contain atleast one benzene ring. Acyclic are open chain compounds.

Fractional distillation is used when:

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If there is a small difference (10 or less) in the boiling points of liquids fractional distillation is used e.g. acetone b.p. 333 K and methanol b.p. 338 K.

Pyrrole is an heterocyclic compound containing ________

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The IUPAC name of the compound: 3HC−CH = CH−COOC2 H5 is Ethyl but-2-enoate. The compound has four carbons in a chain. It has one double bond and an ester group which has a suffix −oate and an ethyl group with ester. So, it cannot be propane. Ester is given more priority than the double bond. Hence, the compound is Ethyl but-2-enoate.

Furan, thiophene and pyridine are called ____ compounds.

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All three compounds are heterocyclic as they have nitrogen or oxygen or sulphur in the ring with carbon.

Two major classes of organic compounds are ____and ____.

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The two major classes of organic compounds are acyclic or open chain compounds containing staurated and unsaturated hydrocarbons and aromatic with benzene ring. Others are subclasses under acyclic and aromatic.

The shapes of Methane ,ethene and acetylene are ____ ,____ and ____ respectively.

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Methane, ethene and acetylene exhibits sp3, sp2 and sp hybridizations respectively. Hence, the geometry of Methane is tetrahedral, ethene is planar and acetylene is linear.

The members of a homologous series have ____ .

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The members would differ only in the formulae by a -CH2 group. They have similar properties, similar general formulae and similar method of preparation.

Molecular mass of a volatile substance may be obtained by

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Without hint.

Which of the following compounds will show metamerism?

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Without hint.

The homolytic fission of C-C bond in ethane produces ____.

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The homolytic fission of C-C bond in ethane produces free radicals. Homolytic cleavage leads to equal distribution of shared electrons. So, the breaking of C-C bond produces free radicals. For e.g., R-X → R• + X•

Which of the following can be used as adsorbent in chromatography?

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Silica gel or alumina are common adsorbents in chromatography.

Which of the following does not have a resonating structure?

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Does not contain benzene nucleus as in other options. Also delocalization of electrons is not possible.

Isomers which can be converted into an another form by rotation of the molecule around the single bond are called ____.

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Isomers which can be converted into an another form by rotation of the molecule around the single bond are called conformers. Conformers are defined as spatial arrangements of atoms which can be converted by rotation around a C-C bond. It is found in alkane e.g. hexane, cyclo hexane, butane, etc.

In sodium fusion test of organic compounds, the nitrogen of the organic compound is converted into

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Sodium cyanide (Na+C+N→NaCN). (Lassaigne’s test)

The solvent in the paper chromatography rises up due to ____.

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The solvent in the paper chromatography rises due to capillary action.

In ethylene, the number of sigma and pi bonds are ____.

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H2C=CH2 In ethylene molecule, the number of sigma bonds between carbon to carbon are 1 the number of sigma bonds between carbon to hydrogen are 4 the number of Pi bonds between carbon to carbon are 1.

Bond length is shortest in:

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Among sp, sp2 and sp3, in a sp-hybridised orbitals the s-character is maximum i.e. 50%. Greater is the s-character, closer is the orbital and nucleus and hence higher is the electro negativity of that carbon. This shortens the carbon to carbon bond length.

The bond formed by ____ overlaping is called ____ bond, which is stronger than the bond formed by ____ overlap.

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The bond formed by axial overlaping is called sigma bond, which is stronger than the bond formed by lateral overlap.

The colourles spots on chromatography plate appears____ in iodine solution.

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The colourles spots on the TLC plate appear brown in the iodine solution.

Class 11th Chemistry - 12 Organic Chemistry- Some Basic Principles & Techniques MCQs
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