Question

The increasing order of reduction of alkyl halides with zinc
and dilute HCl is
(a) R – Cl < R – I < R – Br (b) R — Cl < R – Br < R – I
(c) R – I < R – Br < R – Cl (d) R – Br < R – I < R – Cl

Answer 1

The increasing order of reduction of alkyl halides with zinc  and dilute HCl is R-Cl < R-Br <  R-I.

Option (B) is correct.

Explanation:

• As the size of the halogen increases down the group due to addition of number of electrons yo the valence shell.
• It atomic number also increase down the group.
• The strength of C-XC−X bond also decreases.
• As a result of this reactivity increases.
• Hence, The increasing order of reduction of alkyl halides with zinc and dil. HCl is
• R-Cl < R-Br <  R-I

Thus the increasing order of reduction of alkyl halides with zinc  and dilute HCl is R-Cl < R-Br <  R-I.

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