If the bond length of C-Cl bond in chloromethane is 178pm, what will be the probable bond length of C-Br bond in bromomethane?a)139pmb)156pmc)178pmd)193pmCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Bond length is determined by the size of the atoms involved in the bond and the strength of the bond. The larger the atoms and the weaker the bond, the longer the bond length will be.

In this case, we are comparing the bond length of the C-Cl bond in chloromethane to the bond length of the C-Br bond in bromomethane. Since bromine (Br) is larger than chlorine (Cl), we would expect the C-Br bond length to be longer than the C-Cl bond length.

To determine the probable bond length of the C-Br bond, we can use the concept of bond length trends in the halogens. As we move down the halogen group in the periodic table, the atomic radius increases, leading to longer bond lengths.

Therefore, we can expect the C-Br bond length in bromomethane to be longer than the C-Cl bond length in chloromethane.

The given options are:

a) 139 pm
b) 156 pm
c) 178 pm
d) 193 pm

Based on the trend mentioned earlier, the most probable bond length for the C-Br bond would be larger than the C-Cl bond length of 178 pm. The only option that satisfies this expectation is option D, which is 193 pm.

So, the probable bond length of the C-Br bond in bromomethane would be 193 pm.

Answer

The size of Cl atom is smaller than the size of Br atom as the latter appears lower than Cl in the halogen group. Hence, the carbon-halogen bond length of C-Br must be bigger than that of C-Cl, i.e., 178pm, therefore it must be 193pm.

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