Chemistry Organic Chemistry questions from NEET UG 2013.
Reaction by which benzaldehyde cannot be prepared?
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?
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 the reaction,  $A$ is
Some reaction of amines are given. Which one is not correct?
In DNA the linkages between different nitrogenous bases are:
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:
Given:  (I) and (II) are
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) \(\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_3\)
The order of stability of the following tatutomeric compound is 
$$ \text { The radical } because it has $$
Number of isomeric alcohols of molecular formula $\mathrm{C}_6 \mathrm{H}_{14} \mathrm{O}$ which give positive iodoform test is:
In the following reaction:  Product ' $\mathrm{P}$ ' will not give
The structure of isobutyl group in an organic compound is
Structure of the compound whose IUPAC name is 3-ethyl-2-hydroxy4-methylhex-3-en-5-ynoic acid 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:
Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?
Which of the following chemical system is non aromatic?
Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?
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:
Which of the following compounds will not undergo Friedal-Craft's reaction easily?
Among the following ethers, which one will produce methyl alcohol on treatment with hot concentrated HI?