Chemistry Organic Chemistry questions from NEET UG 2013.
Among the following ethers, which one will produce methyl alcohol on treatment with hot concentrated HI?
Arrange the following in increasing order of stability: (A) \(\left(\mathrm{CH}_3\right)_2 \stackrel{\oplus}{\mathrm{C}}-\mathrm{CH}_2 \mathrm{CH}_3\) (B) \(\left(\mathrm{CH}_3\right)_3-\stackrel{\oplus}{\mathrm{C}}\) (C) \(\left(\mathrm{CH}_3\right)_2-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}\) (D) \(\mathrm{CH}_3-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_2\) (E) \(\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_3\)
Given:  (I) and (II) are
Homolytic fission of the following alkanes forms free radicals $\mathrm{CH}_3-\mathrm{CH}_3$, $\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_3,\left(\mathrm{CH}_3\right)_2 \mathrm{CH}-\mathrm{CH}_3$, $\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}\left(\mathrm{CH}_3\right)_2$. Increasing orders of stability of the radicals is:
In a particular isomer of $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^0$, the $\mathrm{Cl}-\mathrm{Co}-\mathrm{Cl}$ angle is $90^{\circ}$, the isomer is known as:
In DNA the linkages between different nitrogenous bases are:
In the following reaction:  Product ' $\mathrm{P}$ ' will not give
In the reaction,  $A$ is
Nitrobenzene on reaction with conc. $\mathrm{HNO}_3 / \mathrm{H}_2 \mathrm{SO}_4$ at $80-100^{\circ} \mathrm{C}$ forms which one of the following products?
Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?
Number of isomeric alcohols of molecular formula $\mathrm{C}_6 \mathrm{H}_{14} \mathrm{O}$ which give positive iodoform test is:
On hydrolysis of a "compound", two compounds are obtained, One of which on treatment with sodium nitrite and hydrochloric acid gives a product which does not respond to iodoform test. The second one reduces Tollen's reagent and Fehling's solution. The "compound" is:
Phenol is distilled with $\mathrm{Zn}$ dust followed by Friedel-Crafts alkylation with propyl chloride in the presence of $\mathrm{AlCl}_3$ to give a compound (b). (b) is oxidised in the presence of air to form the compound (c). The structural formula of (c) is:
$$ \text { The radical } because it has $$
Reaction by which benzaldehyde cannot be prepared?
Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?
Some reaction of amines are given. Which one is not correct?
Structure of the compound whose IUPAC name is 3-ethyl-2-hydroxy4-methylhex-3-en-5-ynoic acid is
The order of stability of the following tatutomeric compound is 
The structure of isobutyl group in an organic compound is
Which of the following chemical system is non aromatic?
Which of the following compounds will not undergo Friedal-Craft's reaction easily?