Predict the correct intermediate and product in the following reaction H 3 C - C ≡ CH → HgSO 4 H 2 O , H 2 SO 4 intermediate → product ( A ) ( B )

A : H 3 C - C | OH = CH 2 B : H 3 C - C | | O - CH 3

A : H 3 C - C | SO 4 = CH 2 B : H 3 C - C | | O - CH 3

A : H 3 C - C | OH = CH 2 B : H 3 C - C | SO 4 = CH 2

A : H 3 C - C | | O - CH 3 B : H 3 C - C ≡ CH

In the reaction x and y , respectively, are

x = C H 3 I ; y = N a in liq. N H 3

x = C H 3 O H ; y = P d B a S O 4 , quinoline, H 2

x = C H 3 I ; y = P d B a S O 4 , quinoline, H 2

x = C H 3 O H ; y = N a in liq. N H 3

Match List - I with List - II : List - I (Chemicals) List - II (Use / Preparation / Constituent) (a) Alcoholic potassium hydroxide (i) Electrodes in batteries (b) Pd / BaSO 4 (ii) Obtained by addition reaction (c) BHC (Benzene hexachloride) (iii) Used for β - elimination reaction (d) Polyacetylene (iv) Lindlar's catalyst Choose the most appropriate match

a − iii , b − iv , c − ii , d − i

a − ii , b − i , c − iv , d − iii

a - iii , b − i , c − iv , d − ii

a − ii , b − iv , c − i , d − iii

HARD

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Which of the following best describes the electronic structure of the cation formed by protonation of propyne?

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Important Questions on Hydrocarbons

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

In the compound,

$\underset{(I)}{{CH}_{2}} = \underset{(II)}{CH} - C \underset{(III)}{\equiv CH}$

The most acidic hydrogen atom is

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

The major product

(Y)

in the following reactions is:
Question Image

HARD

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

An unsaturated hydrocarbon

' X'

gives white precipitate with Tollen's reagent. If

X

is gaseous in nature, the molecular formula of

X

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

The major product in the following reactions is

$C_{6} H_{5} - C \equiv CH \to_{(ii) HI (1 eq)}^{(i) HCl (1 eq)}$

EASY

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

Which among the following depicts the correct order of acidity?

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

The major product formed in the following reaction is

H_{3} C - C \equiv C - {CH}_{3} + Na \overset{liquid {NH}_{3}}{⟶}

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

The correct sequence of reagents for the following conversion will be

Question Image

HARD

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

A hydrocarbon

X

with molecular formula

C_{4} H_{6}

decolorizes bromine water and forms a white precipitate in ethanolic

{AgNO}_{3}

solution Treatment of

X

with

{HgCl}_{2}

in aqueous

H_{2} {SO}_{4}

produces a compound, which gives a yellow precipitate when treated with

I_{2}

and

NaOH

. The structure of

X

is :

EASY

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

Predict the correct intermediate and product in the following reaction

\begin{matrix} H_{3} C - C \equiv CH & \overset{H_{2} O, H_{2} {SO}_{4}}{\underset{{HgSO}_{4}}{\to}} & intermediate & \to & product \\ (A) & (B) \end{matrix}

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

The major product of the following reaction is

Question Image

EASY

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

Which of the following gives a red precipitate upon reaction with a terminal alkyne?

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

In the reaction

Question Image
$x$ and $y$ , respectively, are

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

Addition of

HBr

to propyne takes place through

Z

. What is

Z

MEDIUM

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

The hydrocarbon which can react with sodium in liquid ammonia is

HARD

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

An organic compound X with molecular formula

C_{6} H_{10},

when treated with

HBr,

forms a gem dibromide. The compound X upon warming with

{HgSO}_{4}

and dil.

H_{2} {SO}_{4},

produces a ketone, which gives a positive iodoform test. The compound X is

EASY

Chemistry>Organic Chemistry>Hydrocarbons>Chemical Reactions of Alkynes

Match List $- I$ with List $- II :$

	List $- I$ (Chemicals)		List $- II$ (Use / Preparation / Constituent)
(a)	Alcoholic potassium hydroxide	(i)	Electrodes in batteries
(b)	$Pd / {BaSO}_{4}$	(ii)	Obtained by addition reaction
(c)	$BHC$ (Benzene hexachloride)	(iii)	Used for $β -$ elimination reaction
(d)	Polyacetylene	(iv)	Lindlar's catalyst