Question

Identify the set of molecules which have similar dipole moment from the following.

• A. \(\text{H}_{2},\text{CO}_{2},\text{BF}_{3},\text{CCl}_{4}\)
• B. \(\text{H}_{2},\text{CO}_{2},\text{NF}_{3},\text{CH}_{4}\)
• C. \(\text{H}_{2},\text{CO}_{2},\text{NH}_{3},\text{CHCl}_{3}\)
• D. \(\text{HBr},\text{CO}_{2},\text{NF}_{3},\text{CHCl}_{3}\)

Hint:

Check which molecules are nonpolar because of a symmetrical shape, giving zero dipole moment.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
A molecule has zero dipole moment if it is homonuclear or if its bond dipoles cancel because of symmetry.

Step 2: Check the First Set
\(\text{H}_2\) is homonuclear, so \(\mu = 0\).
\(\text{CO}_2\) is linear, \(\text{BF}_3\) is trigonal planar and \(\text{CCl}_4\) is tetrahedral, so all have \(\mu = 0\).

Step 3: Check the Other Sets
\(\text{NF}_3\), \(\text{NH}_3\), \(\text{CHCl}_3\) and \(\text{HBr}\) are not symmetrical and have a non-zero dipole moment.

Step 4: Conclusion
Only the first set has all molecules with the same (zero) dipole moment.

Final Answer:
H2, CO2, BF3 and CCl4 all have zero dipole moment. \[ \boxed{\text{(A) }\text{H}_{2},\text{CO}_{2},\text{BF}_{3},\text{CCl}_{4}} \]