Which statement is correct?

PHYSICS · Single correct · ISC · Physics · Electrostatics · Magnetic Effects of Current and Magnetism

Problem

Which statement is correct? (1) m.p. of

\text{H}_2\text{O}

\text{NH}_3

are maximum in their respective group due to intermolecular H-bonding (2) b.p. of

\text{CH}_4

out of

\text{CH}_4

\text{SiH}_4

\text{GeH}_4

and

\text{SnH}_4

is least due to weak intermolecular force of attraction (3) formic acid forms dimer by H-bonding (4) all are correct