List of top Questions asked in CPET- 2025

An extensive property of a thermodynamic system among the following is:
A perfect gas expands reversibly at a constant temperature of 298 K so that its volume doubles. What is the change in the molar internal energy of the gas?
What will be the \(m/z\) value of the base peak in the mass spectrum of n-butyl benzene \((PhCH_2CH_2CH_2CH_3)\)?
The de Broglie wavelength of an \(\alpha\) particle of mass \(6.68 \times 10^{-27}\) kg ejected from radium at a speed of \(1.5 \times 10^{7}\) ms\(^{-1}\) is (h = 6.62 \(\times 10^{-34}\) Js):
What is the IUPAC name of ibuprofen?
Which is not a protecting group for amine in peptide synthesis?
Among the following pairs, those in which both species have similar structures (isostructural) are:
Among \(XeO_3F_2\), \(ICl_2^-\), \(ClO^-\) and \(SO_3^{2-}\), the number of species having three lone pairs of electrons on the central atom according to VSEPR theory is:
The compound that behaves as an acid in H2SO4 (that is, it is a stronger acid than H2SO4 and can protonate it) is:
Sodium nitroprusside gives a violet colour with sulphide ions. The compound (formed in this test) is:
The hybridization of boron in diborane (B2H6) is:
The orbital with two radial and two angular nodes is:
A bicyclic silver carboxylate is treated with Br2 and converts to the corresponding bicyclic bromide, with loss of CO2 and AgBr. The following reaction goes through which intermediate?
The maximum non-PV work that a system can perform at constant pressure and temperature is:
In the IR spectrum, the absorption band due to the carbonyl group in phenyl acetate appears at:
The 1H NMR spectrum of a mixture of benzene and acetonitrile shows two singlets of equal integration. Given that benzene has 6 equivalent protons and acetonitrile (CH3CN) has 3 equivalent protons, the molar ratio of benzene to acetonitrile is:
The compound that gives precipitate on warming with aqueous AgNO3 (i.e. undergoes fastest SN1 solvolysis) is:
The order of acidity of boron trihalides is:
Furan, on treatment with butyllithium followed by reaction with carbon dioxide, produces which compound on acidification?
What is the order of reactivity for furan, pyrrole, thiophene and benzene (towards electrophilic aromatic substitution)?
Which is not a product of oxidation of citral with KMnO4 and CrO3?
Which compound does not show an iodoform test?
Which test is used to distinguish between primary, secondary and tertiary amine?
N-methylpiperidine, when reacted with excess methyl iodide and then moist silver oxide, produces an alkene on heating (Hofmann elimination). Name the alkene formed.
Why does an old sample of benzaldehyde turn blue litmus red?