Organic chemistry-some basic principles and techniques practice · Medium

But-2-yne is reacted separately with one mole of Hydrogen as shown below
$\underline B \xleftarrow[{{\text{liq }}N{H_3}}]{{Na}}C{H_3} - \mathop C\limits_{ + {H_2}} \equiv C - C{H_3}\xrightarrow[\Delta ]{{Pd/C}}\underline A$
(A) A is more than soluble than B.
(B) The boiling point & melting point of A are higher and lower than B respectively.
(C) A is more polar than B because dipole moment of A is zero.
(D) $Br_2$ adds easily to B than A.
Identify the incorrect statements from the option given below

Statement I : A tertiary carbocation is more stable than a secondary carbocation which is more stable than a primary carbocation
Statement II : The inductive effects operate through sigma bonds and decrease rapidly with increase in distance between the substituent and the reaction site

The production of an optically active compound from a symmetric molecule without resolution in termed as :

Arrange the Anions $(\mathrm{p}). {CH}_3, \, \, (\mathrm{q}). {NH}_2, \, \, (\mathrm{r}). {OH}, \, \, (\mathrm{s}). {F}^{-}$ in decreasing order of their basic strength

Incorrect statement for the use of indicators in acid-base titration is :

The number of $s{p^2}$ hybridized carbon atoms present in ‘Aspartame’ are

Which of the following would be the best (most reactive) nucleophile in the polar medium?

Which of the following statement(s) is/are correct ?

(i) A carbon atom having an $s p$ hybrid orbital is less electronegative than carbon atoms possessing $s p^2$ or $s p^3$ hybridised orbitals.

(ii) $\pi$-bonds provide the most reactive centres in the molecules containing multiple bonds

(iii) The number of $\sigma$ and $\pi$ bonds in compound ${CH}_2={C}={CHCH}_3$ are 7 and 2 respectively.

Arrange the following free radicals in order of decreasing stability.

Methyl (I), Vinyl (II), Allyl (III), Benzyl (IV)

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

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.

Which of the following chromates is not yellow in colour?

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

Which of the following compound is not chiral?

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