Consider the following sets of quantum numbers. Which of the following setting is not permissible arrangement of electrons in an atom?

• n = 4; l = 0; m = 0; s = $-\frac{1}{2}$

• n = 5; l = 3; m = 0; s = $+\frac{1}{2}$

• n = 3; l = 2; m = -2; s = $-\frac{1}{2}$

• n = 3; l = 2; m = -3; s = $+\frac{1}{2}$

The increasing order of bond order of O₂, O${}_2^{+}, {\mathrm{O}}_2^{-} \mathrm{and} {\mathrm{O}}_2^{2-}$ is

• ${\mathrm{O}}_2^{+} < {\mathrm{O}}_2 < {\mathrm{O}}_2^{-} < {\mathrm{O}}_2^{2-}$

• ${\mathrm{O}}_2^{2-} < {\mathrm{O}}_2^{-} < {\mathrm{O}}_2^{+} < {\mathrm{O}}_2$

• ${\mathrm{O}}_2 < {\mathrm{O}}_2^{+} < {\mathrm{O}}_2^{-} < {\mathrm{O}}_2^{2-}$

• ${\mathrm{O}}_2^{2-} < {\mathrm{O}}_2^{-} < {\mathrm{O}}_2 < {\mathrm{O}}_2^{+}$

HCl gas is covalent and NaCl is an ionic compound. This is because

• sodium is highly electropositrve

• hydrogen is a non-metal

• HCl is a gas

• electronegativity difference between H and Cl is less than 2.1

Main axis of diatomic molecule is z. The orbitals p_x and p_y overlap to form

• $\mathrm{\pi }$-molecular orbital

• σ-molecular orbital

• δ-molecular orbital

• No bond is formed

An organic compound contains C = 40%, H = 13.33% and N = 46.67%. Its empirical formula is

• C₂H₂N

• C₃H₇N

• CH₄N

• CHN

IUPAC name of the compound,

• 1-bromobut-2-ene

• 2-bromo-2-butene

• bromobutene

• 1-bromobut-3-ene

Benzene carbaldehyde is reacted with conc. NaOH solution to give the products A and B. The product A can be used as a food preservative and the product B is an aromatic hydroxy compound, where -OH group is linked to sp³-hybridised C-atom next to benzene ring. The products A and B respectively are

• sodium benzoate and phenol

• sodium benzoate and phenyl methanol

• sodium benzoate and cresol

• sodium benzoate and picric acid

An organic compound A on reduction gives compound B, which on reaction with trichloromethane and caustic potash forms C. The compound C on catalytic reduction gives N-methyl benzenamine, the compound A is,

• nitrobenzene

• nitromethane

• methanamine

• benzenamine

19.

Which of the following gives positive Fehling's solution test?

• Sucrose

• Glucose

• Fats

• Protein

The hybridisation of C in diamond, graphite and ethyne is in the order.

• sp³, sp, sp²

• sp³, sp², sp

• sp, sp², sp³

• sp², sp³, sp