251.

Increasing order of carbon-carbon bond length for the following is

$\underset{\left(\mathrm{A}\right)}{{\mathrm{C}}_2{\mathrm{H}}_4} \underset{\left(\mathrm{B}\right)}{{\mathrm{C}}_2{\mathrm{H}}_2} \underset{\left(\mathrm{C}\right)}{{\mathrm{C}}_6{\mathrm{H}}_6} \underset{\left(\mathrm{D}\right)}{{\mathrm{C}}_2{\mathrm{H}}_6}$

• C < B < A < D

• B < C < A < D

• D < C < A < B

• B < A < C < D

Hybridised states of carbon in graphite and diamond are respectively

• sp³, sp³

• sp³, sp²

• sp², sp²

• sp² , sp³

Which of the following is not a characteristic of a covalent compound?

• No definite geometry

• Insoluble in polar solvent

• Smal difference in electronegativity between the combining atoms

• Low melting point

A ligand is a

• Bronsted acid

• either a Lewis acid or a Lewis base

• Lewis base

• Lewis acid

The C-H bond and C-C bond in ethane are formed by which of the following types of overlap?

• sp²-s and sp²-sp²

• sp-s and sp-sp

• p-s and p-p

• sp³-s and sp³-sp³

Which one of the following has a magnetic moment of.1.75 BM?

• V³⁺

• Cr³⁺

• Fe³⁺

• Ti³⁺

Which one of the following contains ionic, covalent and coordinate bonds?

• NaCl

• NaCN

• NaNC

• NaOH

Which one of the following is not true regarding electromeric effect?

• It is a temporary effect

• It operates on multiple bonds

• It requires an attacking reagent

• It results in the appearance of partial charges on the carbon atoms

d²sp³ hybridisation of the atomic orbitals gives

• square planar structure

• triangular structure

• tetrahedral structure

• octahedral structure

A group of atoms can function as a ligand only when

• It is a small molecule

• It has an unshared electron pair

• Its a negatively charged ion

• It is a positively charge ion