Which of the following reactions can be used for the preparation of alkyl halides-I CH 3 CH 2 OH - HCl anh- ZnCl 2-II CH 3 CH 2 OH - HCl -III CH 33 COH - HCl -IV CH 32 CHOH - HCl anh - ZnCl 2-A- IV onlyB- III and IV onlyC- I- III and IV onlyD- I and II only

The correct option is C (I), (III) and (IV) onlyLuca's reagent (HCl + ZnCl_2) nbsp;can be used for 1^0/2^0/3^0 alcohols, but if ZnCl_2 is absent then only 3^ ...

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Standard XII

Chemistry

Preparation of Alkyl Halides

Which of the ...

Question

Which of the following reaction(s) can be used for the preparation of alkyl halides ?
(I) $C H_{3} C H_{2} O H + H C l a n h . Z n C l_{2} - ----- \to$
(II) $C H_{3} C H_{2} O H + H C l \to$
(III) $(C H_{3})_{3} C O H + H C l \to$
(IV) $(C H_{3})_{2} C H O H + H C l a n h . Z n C l_{2} - ----- \to$

(IV) only

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(III) and (IV) only

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(I), (III) and (IV) only

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(I) and (II) only

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Solution

The correct option is C (I), (III) and (IV) only
Luca's reagent $(H C l + Z n C l_{2})$ can be used for $1^{0} / 2^{0} / 3^{0}$ -alcohols, but if $Z n C l_{2}$ is absent then only $3^{0}$ alcohol can be used. This is because it is reactive due to the formation of a stable $3^{0}$ carbocation.

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Similar questions

Q. Which of the following reaction(s) can be used for the preparation of alkyl halides?
(I)

C H_{3} C H_{2} O H + H C l a n h . Z n C l_{2} - ----- \to

(II)

C H_{3} C H_{2} O H + H C l \to

(III)

(C H_{3})_{3} C O H + H C l \to

(IV)

(C H_{3})_{2} C H O H + H C l a n h . Z n C l_{2} - ----- \to

Q. Among the following the compounds which can undergo an

S_{N} 1

reaction in an aqueous solution, are:

Q. Which among the following metal carbonyls are diamagnetic inner orbital complexes?

(I) N i (C O)_{4}

(I I) F e (C O)_{5}

(I I I) V (C O)_{6}

(I V) C r (C O)_{6}

Select the correct answer from the codes given below:

Q. Which of the following steps are ATP dependent in urea cycle?
I. Combination of ammonia and

C O_{2}

II. Conversion of ornithine to citrulline
III. Reaction of citrulline with aspartate
IV. Formation of urea

Q. In the case of noble gases, the following trend

X e > K r > A r > N e > H e

is correct for: i) boiling point ii) solubility in water iii) ionization enthalpy iv) ease of liquefaction.

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Which of the following reaction(s) can be used for the preparation of alkyl halides ? (I) CH3CH2OH+HClanh.ZnCl2−−−−−−→ (II) CH3CH2OH+HCl→ (III) (CH3)3COH+HCl→ (IV) (CH3)2CHOH+HClanh.ZnCl2−−−−−−→

The correct option is C (I), (III) and (IV) onlyLuca's reagent (HCl+ZnCl2) can be used for 10/20/30-alcohols, but if ZnCl2 is absent then only 30 alcohol can be used. This is because it is reactive due to the formation of a stable 30 carbocation.

Which of the following reaction(s) can be used for the preparation of alkyl halides ?
(I) $C H_{3} C H_{2} O H + H C l a n h . Z n C l_{2} - ----- \to$
(II) $C H_{3} C H_{2} O H + H C l \to$
(III) $(C H_{3})_{3} C O H + H C l \to$
(IV) $(C H_{3})_{2} C H O H + H C l a n h . Z n C l_{2} - ----- \to$

The correct option is C (I), (III) and (IV) only
Luca's reagent $(H C l + Z n C l_{2})$ can be used for $1^{0} / 2^{0} / 3^{0}$ -alcohols, but if $Z n C l_{2}$ is absent then only $3^{0}$ alcohol can be used. This is because it is reactive due to the formation of a stable $3^{0}$ carbocation.