Organic chemistry-some basic principles and techniques practice · Mixed difficulty

An organic compound contains $\mathrm{C}=40 \%, \mathrm{H}=13.33 \%$ and $\mathrm{N}=46.67 \%$. Its empirical formula would be

The homolytic fission of a covalent bond liberates

Assertion: Gravimetric analysis is a time-consuming method of analysis.

Reason: Gravimetric analysis requires the isolation and weighing of a product formed from the analyte, which can be a time-consuming process.

$d$- tartaric acid and $l$- tartaric acid are :

Ammonium salts on heating with slaked lime liberate a colourless gas $(X)$. Identify the incorrect statement for gas $(X)$.

Assertion: Tautomerism is shown by all nitro alkanes.

Reason: Tautomerism is shown only when mobile ${H}$ is present, so $1^{\circ}$ and $2^{\circ}$ nitro alkanes show tautomerism.

Hyperconjugation is:

In sodium extract test of organic compounds, the nitrogen of an organic compound is converted into:

Strongest nucleophile among the following is

Assertion (A): The percentage of oxygen in an organic compound is usually found by difference between the total percentage composition (100) and the percentages of all other elements.

Reason (R): Oxygen is present everywhere.

An organic compound A is oxidised with $N{a_2}{O_2}$ followed by boiling with $HN{O_3}$. The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate. Based on above observation, the element present in the given compound is

0.5 g of hydrocarbon gave 0.9 g water on combustion. The percentage of carbon hydrocarbon is

The correct order of acidic strength is:

Given below are two statements.
Statement I: The presence of weaker $\pi {\text{ - }}$ bonds make alkenes less stable than alkanes.
Statement II: The strength of the double bond is greater than that of carbon-carbon single bond.
In the light of the above statements, choose the correct answer from the options given below.

Assertion (A) : $\mathrm{SO}_3$ is a nucleophile.

Reason (R): $\mathrm{SO}_3$ has lone-pair of electrons.

Which of the following techniques is based on adsorption of organic compounds on an adsorbent to different degrees?

Which of the following chromates is not yellow in colour?

The compound ${C_4}{H_{10}}O$ can show

In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of $AgBr$. The percentage of bromine in the compound is (at. Mass $Ag$ = 108, $Br$ = 80)

Which of the following compound is not chiral?

Fluorine is not tested by Beilstein’s test because

The percentage of $'s'$ character of the hybrid orbital of carbon in ethane, ethane and ethyne respectively are:

How many isomers are possible for the compound having molecular formula ${\mathrm{C}_3}{\mathrm{H}_5}\mathrm{B}{\mathrm{r}_3}$?

Consider the following:

$\text{I. }\mathrm{S H}^{-} \quad \text{ II. }\mathrm{F}^{-} \quad \text{ III. }{{\ddot{\text{N}}}}{{\text{H}}_3}\quad \text{ IV. }\mathrm{OH}^{-} \quad \text{ V. }\mathrm{OR}^{-}$

What is the correct order of decreasing nucleophilicity in water?

Fischer projection indicates :

A Dewar flask is usually used to:

Racemic mixture is formed by mixing two

Assertion: The IUPAC name of $HC \equiv C - C{H_2} - CH = C{H_2}$ is pent-4-en-1-yne.

Reason: A triple bond is always given a lower locant than a double bond.

The pair of electrons in the given carbanion, $C{H_3}\,C \equiv {C^ - }$ , is present in which of the following orbitals

The phenomenon of existence of two or more compounds possessing the same molecular formula but different properties is called