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Halogenation ...

Halogenation of Alkynes

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Q. For the following reaction:

I . C H_{3} C H_{2} C H_{2} B r + K O H \to C H_{3} C H = C H_{2} + K B r + H_{2} O

Which of the following statements is correct?

$I$ and $I I$ are elimination reactions, $I I I$ is addition reaction
$I$ is elimination, $I I$ is substitution, $I I I$ is addition reaction
$I$ is elimination reaction, $I I$ and $I I I$ are substitution reactions
$I$ is substitution reaction, $I I$ and $I I I$ are addition reactions

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Q.

In the Iodination of alkane, Some HIO₃ is added so that :

Reaction is made faster
HI formed is Oxidisid to I₂
Reaction is made more selutive
None of the above

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Q. The compound which reacts fastest with Lucas reagent at room temperature is:

$Butan-1-ol$
$Butan-2-ol$
$2-methylpropan-1-ol$
$2-methylpropan-2-ol$

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Q. The reagent needed for converting

$H_{2}$ / Lindlar's catalyst
Catalytic hydrogenation
$L i A l H_{4}$
$N a / N H_{3}$

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Q. Which of the following reagents are not correctly matched with the reaction?

$C H_{3} C H = C H C H O \to C H_{3} C H = C H C O O H : A m m o n i a c a l A g N O_{3}$
$C H_{3} C H = C H C H O \to C H_{3} C H - C H C H_{2} O H : K M n O_{4}$
$R - C H O \to R - C H_{2} O H : N a B H_{4}$
$C H_{3} C H_{2} C O C l \to C H_{3} C H_{2} C H O : H_{2}, P d / B a S O_{4}$

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Q. What is the final major product "B" of the following reaction ?

2, 4-dichlorobutane
1, 2-dichlorobutane
2, 3-dichlorobutane
None of the above

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Q. How many of the following addition reactions are

s y n

addition reaction?

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Q. An organic compound decolourises bromine in

C C l_{4}

and can be reduced catalytically. The compund can be

$C H_{3} - C H_{2} - C H_{2} - C H_{3}$
$C H_{3} - C H_{2} - C \equiv C H$
Both (a) and (b)
None of the above

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Q. Reduction of aryl nitriles in presence of

L i A l H_{4}

gives:

Aryl nitrocompounds
Aryl isocyanides
Alkyl amines
All of the above.

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Q. Which of the following pair of compounds which will react faster in

S_{N} 2

reaction with

(C H_{3})_{3} C - B r

or

C H_{3} B r

?

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Q. The correct order of chemical reactivity in halogens is:

$F_{2} > B r_{2} > {C l}_{2} > I_{2}$
$F_{2} > {C l}_{2} > B r_{2} > I_{2}$
$F_{2} > I_{2} > B r_{2} > {C l}_{2}$
$F_{2} > {C l}_{2} > I_{2} > B r_{2}$

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Q. How many of the following addition reactions are

s y n

addition reaction?

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Q. Predict the principal product in given reaction.

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Q. The correct decreasing order of their reactivity towards hydrolysis is:

$(i i) > (i v) > (i) > (i i i)$
$(i) > (i i) > (i i i) > (i v)$
$(i i) > (i v) > (i i i) > (i)$
$(i v) > (i i) > (i) > (i i i)$

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Q. The incorrect reaction out of the following is:

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Q. What is the final major product "B" of the following reaction?

2, 4-dichlorobutane
1, 2-dichlorobutane
2, 3-dichlorobutane
None of the above

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Q. The correct decreasing order of reactivity for a given alkyl

(R)

group in both

S_{N} 1

and

S_{N} 2

reaction mechanisms is:

$R - I > R - B r > R - C l > R - F$
$R - I > R - C l > R - B r > R - F$
$R - F > R - C l > R - B r > R - I$
$R - F > R - I > R - C l > R - B r$
$R - B r > R - I > R - F > R - C l$

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Q. Which of the following compounds exists as a nonresolvable racemic mixture?

${C H}_{3} {C H}_{2} C H (O H) {C H}_{2} {C H}_{3}$
${C H}_{3} C H O H C O O H$
${C H}_{3} {C H}_{2} N H {C H}_{2} {C H}_{3}$
$C_{2} H_{5} {C H}_{3} | N^{+} | C_{2} H_{5} - C H {({C H}_{3})}_{2} {B r}^{-}$

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Q. Complete the following chemical equations:

C_{6} H_{5} N_{2} C l + {C H}_{3} {C H}_{2} O H \to

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Q. The incorrect reaction out of the following is:

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Q. What do you mean by activity and selectivity of catalysts?

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Q. Why

K I - s t a r c h

solution become blue on adding water to chlorine?

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Q. How many of the following reactions or processes is/are exothermic ?
(i)

2 H (g) \to H_{2} (g)

(ii)

C (d i a m o n d) \to C (g r a p h i t e)

(iii)

C H_{4} + O_{2} \to C O_{2} + H_{2} O

(iv)

C_{2} H_{6} \to C_{2} H_{4} (g) + H_{2} (g)

(v)

c i s - 2 - b u t e n e \to t r a n s - 2 - b u t e n e

(vi)

w h i t e P \to r e d P .

(vii)

H_{2} O (l) \to H_{2} O (s)

(viii)

N a^{+} (g) + a q \to N a + (a q)

(ix)

N a O H + H_{2} S O_{4} \to N a_{2} S O_{4} + H 2 O

(x)

H N O_{3} + w a t e r \to S o l u t i o n

.
(xi)

e t h a n o l + w a t e r \to S o l u t i o n .

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Q. Identify the alkynes

A (C_{10} H_{18})

and

B (C_{10} H_{16})

which gives the following reactions:

Alkyne (A) H_{2} + P l - --- \to 2 m o l ↓ C_{2} H_{5} M g B r Decane

(B) + C_{2} H_{6}

(gas)

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Q. The reduction of 4-octyne with

H_{2}

in the presence of

P d / B a S O_{4}

and quinoline gives :

trans-4-octene
cis-4-octene
a completely reduced product $C_{8} H_{18}$
a mixture of cis and trans-4-octene

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Q. What product, or products, would you expect from the given reaction? Name the mechanism (

S_{N} 1

or

S_{N} 2

) that gives each product(s).

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Q. An organic compound decolourises bromine in

C C l_{4}

and can be reduced catalytically. The compund can be

$C H_{3} - C H_{2} - C H_{2} - C H_{3}$
$C H_{3} - C H_{2} - C \equiv C H$
Both (a) and (b)
None of the above

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Q. From amongst the following alcohols the one that would react fastest with conc HCl and anhydrous

Z n C l_{2}

?

2-butanol
2-methylpropan-2-ol
2-methylpropanol
1-butanol

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Q. Correct order of reactivity of halogens is:

$I_{2} > B r_{2} > C l_{2} > F_{2}$
$C l_{2} > B r_{2} > I_{2} > F_{2}$
$B r_{2} > I_{2} > C l_{2} > F_{2}$
$F_{2} > C l_{2} > B r_{2} > I_{2}$

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Q. Convert chloroethane to butane

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