List of top Questions asked in KEAM- 2018

Barbiturates are potent
The nitrosation of N,N-dimethylaniline takes place through the attack of electrophile
Mass % of carbon in ethanol is
The nitrogenous base present only in RNA is
Green fuel is the fuel obtained from
Oxidation of 1\(^\circ\) alcohols to aldehydes is very successful for the alcohols like
The halogen compound which will not react with phenol to give ethers is
Neopentyl bromide undergoes dehydrohalogenation to give alkenes even though it has no \(\beta\)-hydrogen. This is due to
The compound which does not lead to nitrile by substitution with NaCN/DMSO is
The compound that does not undergo haloform reaction is
The weakest among the following acids is
Number of constitutional isomers of alkane with formula $C_6H_{14}$ is
Phenylacetylene on treatment with \(HgSO_4/H_2SO_4, H_2O\) produces
Which one of the following statements is false ?
The effective nuclear charge of an element with three valence electrons is 2.60. What is the atomic number of the element?
The elution sequence of a mixture of compounds containing chlorobenzene, anthracene and p-cresol developed on an alumina column using a solvent system of progressively increasing polarity is
Which of the following compounds are aromatic?
Aromatic electrophilic substitution reaction that is reversible is
More than four bonds are made by how many elements in carbon family?
How many peroxy linkages are present in \(CrO_5\)?
Consider the following compounds
1. \((NH_4)_2Cr_2O_7\) 2. \(NH_4NO_2\) 3. \(NH_4VO_3\) 4. \(NH_4NO_3\)
Which compound(s) yield nitrogen gas upon heating?
When \(H_2O_2\) is added to an acidified \(K_2Cr_2O_7\) solution
Select the correct option(s) for the following statements
1. \(Cl_2O\) and \(ClO_2\) are used as bleaching agents
2. \(OCl^-\) salts are used as detergents
3. \(OCl^-\) disproportionates in alkaline medium
4. \(BrO_3^-\) is oxidized in acidic medium
Which of the following combination is correct?
Consider the following species
1. $[O_2]^{2-}$ 2. $[CO]^+$ 3. $[O_2]^+$
Among these sigma bond alone is present in
Consider the following statements concerning $N_2H_4$
1. It is an exothermic compound
2. It burns in air with the evolution of heat
3. It has kinetic stability
4. It reduces $Fe^{3+}$ to $Fe^{2+}$ in acidic medium
Which of the following combination is correct?