C2H6 (ethane) and C2H5OH (ethanol) have different functional groups, making them functional isomers.

Cis-2-butene and trans-2-butene differ in the arrangement of groups around the double bond, making them geometric isomers.

Ethyl alcohol (ethanol) and dimethyl ether have the same molecular formula but different structures.

Cerium (Ce) and Lanthanum (La) are both f-block elements.

Cerium (Ce) and Lanthanum (La) are both lanthanides, which are f-block elements.

The first pair has the same slope (2/3) and thus represents parallel lines.

The first pair represents parallel lines, which means they will never intersect, hence no solution.

N2 and CO both have a bond order of 3.

All pairs have the same remainder when divided by 6: 8 mod 6 = 2, 14 mod 6 = 2; 10 mod 6 = 4, 16 mod 6 = 4; 12 mod 6 = 0, 18 mod 6 = 0.

15 and 28 have no common factors other than 1, making their GCD equal to 1.

15 and 28 are coprime, meaning their GCD is 1.

The LCM of 4 and 9 is 36.

The HCF of 15 and 28 is 1, making them coprime.

The HCF of 12 and 18 is 6, as both numbers are divisible by 6, while the other pairs have higher HCFs.

The GCF of 15 and 28 is 1, making them coprime, while the other pairs share common factors.

The electron is the only particle listed that has a negative charge.

The electron has the least mass compared to protons and neutrons.

The mass of an electron is significantly less than that of protons and neutrons.

The electron has the least mass compared to protons and neutrons.

Among the given particles, the electron has the smallest mass, approximately 1/1836 of a proton.

Beta decay involves the emission of beta particles, which are electrons or positrons.

Pions are mesons, not baryons. Baryons are particles made up of three quarks, while mesons are made up of a quark and an antiquark.

Electrons are not constituents of the nucleus; they orbit around the nucleus, while protons and neutrons are found within it.

An electron is not a nucleon; nucleons are particles found in the nucleus, which include protons and neutrons.

Electrons are not found in the nucleus; they orbit around the nucleus, while protons and neutrons are the constituents of the nucleus.

Electrons are not found in the nucleus; they orbit around it.

Lord Dalhousie introduced the Doctrine of Lapse, which allowed the British to annex any princely state if the ruler died without a male heir.

Chandragupta Maurya founded the Maurya Empire in 322 BCE, marking the beginning of a significant era in Indian history.

Interference is a phenomenon that can be explained by the wave nature of light, as it involves the superposition of light waves.

All of the mentioned phenomena (photoelectric effect, Compton effect, and diffraction) demonstrate the wave-particle duality of light.