The correct sequence of bond enthalpy of $C-X$ bond is:

  • A
    $CH_{3}-F < CH_{3}-Cl < CH_{3}-Br < CH_{3}-I$
  • B
    $CH_{3}-F > CH_{3}-Cl > CH_{3}-Br > CH_{3}-I$
  • C
    $CH_{3}-F < CH_{3}-Cl > CH_{3}-Br > CH_{3}-I$
  • D
    $CH_{3}-Cl > CH_{3}-F > CH_{3}-Br > CH_{3}-I$

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The increasing order of densities of the following alkyl halides is:
$(I)$ $n-C_3H_7Br$
$(II)$ $n-C_3H_7Cl$
$(III)$ $n-C_3H_7I$

Match the $CH_{3}X$ compounds in Column-$(I)$ with their $C-X$ bond length in Column-$(II)$ and dipole moment in Column-$(III)$.
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$(A)$ $H_3C-F$$(i)$ $214$$(1)$ $1.636$
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$(C)$ $H_3C-Br$$(iii)$ $178$$(3)$ $1.847$
$(D)$ $H_3C-I$$(iv)$ $139$$(4)$ $1.860$

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Identify $A$ and $B$ in the following reactions:
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Which of the following is product $A$ in the above reaction?

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