JEE Advanced 2020 · Paper 2 · Chemistry Q2

ChemistryInteger+3 / -1Question 20 of 54

Consider the following compounds in the liquid form:

$\ce{O2}$ , $\ce{HF}$ , $\ce{H2O}$ , $\ce{NH3}$ , $\ce{H2O2}$ , $\ce{CCl4}$ , $\ce{CHCl3}$ , $\ce{C6H6}$ , $\ce{C6H5Cl}$ .

When a charged comb is brought near their flowing stream, how many of them show deflection as per the following figure?

Your answer

Answer and worked solution

Official answer: 6

A stream is pulled towards a charged comb only if its molecules have a permanent dipole moment.

Polar (deflected): $\ce{HF}$ , $\ce{H2O}$ , $\ce{NH3}$ , $\ce{H2O2}$ , $\ce{CHCl3}$ , $\ce{C6H5Cl}$ .

Non-polar (not deflected): $\ce{O2}$ , $\ce{CCl4}$ (tetrahedral), $\ce{C6H6}$ (symmetric).

Answer: 6

Topics:Bond parameters and dipole moment

JEE Advanced 2020 · Paper 2, Chemistry question 2