Some Basic Concepts of Organic Chemistry

\(\text { The following carbocation is stabilized by the interaction of the empty } p \text { orbital with }\)

\(\text { The correct IUPAC name of the following compound is : }\)

During Lassaigne's test, the elements present in an organic compound are converted from :

Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula $\mathrm{C}_4 \mathrm{H}_8 \mathrm{O}$ is :

Among the given compounds I-III, the correct order of bond dissociation energy of C-H bond marked with * is :

How many products (including stereoisomers) are expected from monochlorination of the following compound?

Which one of the following compounds can exist as cis-trans isomers?

Match List-I with List-II

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Match List-I with List-II

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Methyl group attached to a positively charged carbon atom stabilizes the carbocation due to

The correct IUPAC name of the compound

is :

Match List-I with List-II :

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A steam volatile organic compound which is immiscible with water has a boiling point of \(250^{\circ} \mathrm{C}\). During steam distillation, a mixture of this organic compound and water will boil :

A compound with a molecular formula of \(\mathrm{C}_6 \mathrm{H}_{14}\) has two tertiary carbons. Its IUPAC name is :

The most stable carbocation among the following is :

During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of \(\mathrm{Fe}^{2+}\) ion?

On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as

Given below are two statements:
Statement I : The boiling point of three isomeric pentanes follows the order
n-pentane > isopentane > neopentane
Statement II : When branching increases, the molecule attains a shape of sphere. This results i...

Given below are two statements:
Statement I : In an organic compound, when inductive and electromeric effects operate in opposite directions, the inductive effect predominates.
Statement II : Hyperconjugation is observed in o-xylene.
In the...

The correct order for the rate of \(\alpha,\beta\)-dehydrohalogenation for the following compounds is _________.

Which amongst the following compounds will show geometrical isomerism?

Which amongst the following compounds/species is least basic?

Consider the following compounds/species:

The number of compounds/species which obey Huckel's rule is ___________.

Amongst the given options which of the following molecules/ion acts as a Lewis acid?

In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with \(\mathrm{Fe}^{3+}\) due to the formation of-

The number of \(\sigma\) bonds, \(\pi\) bonds and lone pair of electrons in pyridine, respectively are:

Which of the following is the most stable carbocation?

What is the hybridization shown by C1 and C2 carbons, respectively in the given compound?
OHC \(-\) CH = CH \(-\) CH2COOCH3

Predict the order of reactivity of the following four isomers towards SN2 reaction.
(I) CH3CH2CH2CH2Cl
(II) CH3CH2CH(Cl)CH3
(III) (CH3)2CHCH2Cl
(IV) (CH3)3CCl

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Chlorine is an electron withdrawing group but it is ortho, para directing in electrophilic aromatic substitution.
Rea...

The correct IUPAC name of the following compound is

The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?

The incorrect statement regarding chirality is

Which compound amongst the following is not an aromatic compound?

Dihedral angle of least stable conformer of ethane is :

The compound which shows metamerism is :

Paper chromatography is an example of :

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?

The compound that is most difficult to protonate is :

Which of the following is correct with respect
to – I effect of the substituents? (R = alkyl)

Which of the following carbocations is
expected to be most stable?

Which of the following molecules represents
the order of hybridisation sp2
, sp2
, sp, sp from
left to right atoms?

The correct statement regarding electrophile is

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is

The IUPAC name of the compound

Which among the given molecules can exhibit tautomerism?

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is

In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is

Consider the following compounds :

Hyperconjunction occurs in

The enolic form of ethyl accetoacetate as shown below has