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Standard XII

Chemistry

Methods for Ester Synthesis

A keto ester ...

Question

A keto ester (X) with molecular formula $C_{6} H_{10} O_{3}$ on treatment with NaOH and $I_{2}$ does not give iodoform but on boiling with dilute KOH gives a compound (Y) with molecular formula $C_{4} H_{5} O_{3} K$ which upon acidification followed by heating undergoes decarboxylation to give acetone. The keto ester (X) is?

C H_{3} C O C H_{2} C H_{2} C O O C H_{3}

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C H_{3} C O C H_{2} C O O C_{2} H_{5}

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C H_{3} C H_{2} O C H_{2} C O O C H_{3}

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C H_{3} C O C H (C H_{3}) C O O C H_{3}

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Solution

The correct option is B $C H_{3} C O C H_{2} C O O C_{2} H_{5}$
An Iodoform test is given by Ketones where a free methyl group is attached to a carbonyl group. In the above given options all the option has a free methyl group attached to carbonyl group except option B.

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Similar questions

Q. A hydrocarbon (X) of the formula

C_{6} H_{12}

does not react with bromine water but reacts with the bromine in presence of light, forming compound (Y). Y on treatment with alc.

K O H

gives compound (Z) which on ozonolysis gives (T) of the formula

C_{6} H_{10} O_{2}

. T reduces Tollens's reagent which give compound (W) on acidification. W gives iodoform test and after acidification produces compound (U) which when heated with

P_{2} O_{5}

forms a cyclic anhydride (V).

Q. A compound (X) has the molecular formula

C_{3} H_{7} N O

with

{B r}_{2}

and

K O H

, (X) gives (Y) (Y) responds to mustard oil reaction. (Y) upon treatment with

{H N O}_{2}

gives:

Q. A compound

X

has the molecular formula

C_{7} H_{7} N O

. On treatment with

{B r}_{2}

and

K O H

X

gives an amine

Y

Y

gives carbylamine test.

Y

upon diazotisation and coupling with phenol gives an azodye

Z

. The compound

X

is :

Q. A compound

X

has molecular formula

C_{7} H_{7} N O

. On treatment with

{B r}_{2}

and

K O H

X

gives an amine

Y

. The later gives carbylamine test.

Y

upon diazotisation and coupling with phenol gives an azo dye. Thus,

X

is :

Given compound (A) upon treatment with

K M n O_{4} / H^{+}

gives (B), which on heating with ammonia produces (C). (C) on treatment with

B r_{2} / N a O H

produces (D). Strongly heating (C) produces (E) which on further reatment with ethyl 2-bromoacetate in the presence of

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followed by acidification gives (F).

(D) is:

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A keto ester (X) with molecular formula C6H10O3 on treatment with NaOH and I2 does not give iodoform but on boiling with dilute KOH gives a compound (Y) with molecular formula C4H5O3K which upon acidification followed by heating undergoes decarboxylation to give acetone. The keto ester (X) is?

The correct option is B CH3COCH2COOC2H5An Iodoform test is given by Ketones where a free methyl group is attached to a carbonyl group. In the above given options all the option has a free methyl group attached to carbonyl group except option B.

The correct option is B $C H_{3} C O C H_{2} C O O C_{2} H_{5}$
An Iodoform test is given by Ketones where a free methyl group is attached to a carbonyl group. In the above given options all the option has a free methyl group attached to carbonyl group except option B.