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(A) With excess HI anisole gives a mixtu...

(A) With excess HI anisole gives a mixture of iodobenzene and methyl iodide
(R) The reaction between anisole and HI takes place via `SN^2` mechanism.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

Verified by Experts

The correct Answer is:
D
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Why anisole does not give iodobenzene with excess HI ?

Which of the following reaction takes place when a mixture of concentrated HNO_3 and H_2SO_4 reacts on benzene at 300 K.

Knowledge Check

  • Which of the following reaction takes place through SN^2 mechanism ?

    A
    `CH_3 -CH_2 -O-CH_2 - CH_3 + HI to CH_3CH_2I + CH_3CH_2OH`
    B
    `CH_3 - CH_2 - OH + HBr overset(Delta)(to) CH_3CH_2Br + H_2O`
    C
    `(CH_3)_3C - OH + HI to (CH_3)_3C - I + H_2O `
    D
    both 1 and 2

  • Aliphatic nucleophilic substitution mainly takes place by two mechanisms (i.e) SN^1 & SN^2 Primary halides mainly undergo by SN^2 mechanism and are favourable in polar aprotic solvents. SN^1 reactions takes place mainly by tertiary halide and are more favourable in polar protic solvents, In case of tertiary halides, E_1 comes competition to SN^1 reaction. Keeping in view of these general points, answer the following questions Which of the following reactions, the reactions takes place by SN^1 mechanism mainly.

    A
    B
    C
    D
    `CH_3CH_2CH_2Br`

  • (A) Phenetole on cleavage with HI gives phenol & ethyl iodide (R) Phenetole is a mixed aromatic ether

    A
    Both (A) and (R) are true and (R) is the correct explanation of (A)
    B
    Both (A) and (R) are true and (R) is not the correct explanation of (A)
    C
    (A) is true but (R) is false
    D
    Both (A) and (R) are false

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    (A) Thionyl chloride reacts with primary alcohols to form pure alkyl halides in the presence of pyridine. (R) In the reaction between SOCl_2 and R-OH, SO_2 escapes from the reaction mixture and HCI is absorbed by pyridine.

    (A): Thionyl chloride reacts with primary alcohols to form alkyl halides. (R): In the reaction between SOCI_2 and R-OH,SO_2 escapes from the reaction mixture.

    Carbonyl compounds give different oxidation products with different reagents .Several oxidising agents can be used to oxidise carbonyy compounds .Ammonical silver nitate (tollens reagent ) oxidises aliphatic as well as aromatic aldehydes . R-CHO overset("Tollens reagents ") to R-COOh +Ag (silver mirror ) strong oxidatising agents like KMnO_4 //H^+ ,HNO_3 ,K_2 Cr_2 O_7 //H^+ oxidise Aldehydes as well as ketons . open chain ketons in oxidation give mixture of two carbonylic acids . oxidation as well as ketons of unsymmetrical ketons takes place according to popoff's rule .According to this rule alpha - carbon whose bond breaks in oxidation always belongs to the alkyl group which has more number of carbons 2 methyl cyclohexanone in oxidation wil give

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