Addition of Halogen Acid for Alkynes

Q. Identify the incorrect statement/statements :
(i) Alkynes are more reactive than alkenes towards electrophilic addition reaction
(ii) Alkynes are less reactive than alkenes towards electrophilic addition reaction
(iii) Alkynes decolourise $B{r}_2$ water
(iv) Addition of $HBr$ to alkenes in presence of peroxide proceeds via Markovnikov's rule

1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (iv)
4. (ii) and (iv)

Q. Propene when reacted with water in the presence of dilute $H_{2}S{O}_4$ gives

1. Propan-1-ol
2. Propan-2-ol
3. 2-Methylpropan-1-ol
4. 2-Methylpropan-2-ol

Q. What is the main product of the reaction between 2-methylpropene with HBr ?

1. 1-bromobutane
2. 1-bromo-2-methylpropane
3. 2-bromobutane
4. 2-bromo-2-methylpropane

Q. Ozonolysis of $C{H}_3-CH=C=C{H}_2$ will give

1. Only $C{H}_{3}CHO$
2. Only $HCHO$
3. Only $C{H}_{3}CHO$ and $HCHO$
4. Mixture of $C{H}_{3}CHO,HCHO$ and $C{O}_2$

Q.

Alkynes are less reactive than alkenes towards addition of $B{r}_2$ because.

1. 
2. 
3. Both are equally stable
4. Original statement is incorrect

Q. 2-methylpropane is chlorinated. The major product is

1. 1-chloro-2-methylpropane
2. 2-chloro-2-methylpropane
3. Both are equally formed
4. 2-chloro-2-methylpropane is obtained in excess, slightly.

Q.

When $1-$Methylcyclohexene is treated with $\mathrm{HCl}$, it produces

1. $1$-Chloro-cyclohexane

2. $1$-Chloro-$2$-methylcyclohexane

3. $1$-Chloro-$1$-methylcyclohexane

4. $2$-Chloro-$1$-methylcyclohexane

Q. CH3-CH-CH2-Cl+ aq KOH------ product | CH3 Find the product.

Q. Which of the following is not true for $S_{N}1$ reaction?

1. Favoured by polar solvents.
2. $3^{\circ }$ alkyl halides generally react through $S_{N}1$ reaction.
3. The rate of the reaction does not depend upon the molar concentration of the nucleophile.
4. $1^{\circ }$ alkyl halides generally react through $S_{N}1$ reaction.

Q. The major product formed when excess of $HCl$ reacts with 2-Butyne?

1. 
2. 
3. 
4. 

Q. The intermediate during the addition of HCl to propene in the presence of peroxide is

1. $\stackrel{+}{C{H}_{3}CHC{H}_3}$
   
2. $\stackrel{\cdot }{C{H}_{3}CHC{H}_{2}Cl}$
   
3. $C{H}_{3}C{H}_2\stackrel{\cdot }{C{H}_2}$
   
4. $C{H}_{3}C{H}_2\stackrel{+}{C{H}_2}$

Q. The name of the product obtained by the addition of HI to propene in presence of peroxide catalyst is

1. Isopropyl iodide
2. 2-Iodopropene
3. 2-Iodopropane
4. 1-Iodopropane

Q. Which will form 2, 2-dibromopropane with $HBr$ ?

1. 
2. 
3. 
4. Both (b) and (c)

Q. The intermediate formed when $C{l}_2$ reacts with benzene in presence of $AlC{l}_3$ is:

1. 
2. 
3. 
4. (a) and (b) both can be formed

Q.

1-butyne reacts with cold alkaline KMnO4 to produce

1. 

2. 

3. 

4. 

Q. Which of the following reactions will yield 2, 2-dibromopropane as the major product?

1. $C{H}_3-C\equiv CH+2HBr\to$
2. $C{H}_3-CH=CHBr+HBr\to$
3. $CH\equiv CH+2HBr\to$
4. $C{H}_3-CH=C{H}_2+HBr\to$

Q.

What is the other name for Anti Markovnikov rule?

Q. Which of the following is more reactive towards addition of $HCl$?

1. 
2. 
3. 
4. 

Q. The reagents required for the following two step transformation are

1. (i) HBr, benzoyl peroxide ; (ii) $C{H}_{3}CN$
2. (i) HBr ; (ii) NaCN
3. (i) $B{r}_2$ ; (ii) NaCN
4. (i) NaBr ; (ii) NaCN

Q. Increasing rate of $S_{N}1$ reaction in the following compounds is:

1. $\left(B\right)<\left(A\right)<\left(C\right)<\left(D\right)$
2. $\left(B\right)<\left(A\right)<\left(D\right)<\left(C\right)$
3. $\left(A\right)<\left(B\right)<\left(D\right)<\left(C\right)$
4. $\left(A\right)<\left(B\right)<\left(C\right)<\left(D\right)$

Q. Identify compound $Z$ in the following sequence of reactions.
$RMgX+C{O}_2\to Y\stackrel{H_3{O}^{+}}{\to }Z$

1. A carboxylic acid
2. An aldehyde
3. A ketone
4. An alcohol

Q. What is the major organic product of the following reaction?

1. 
2. 
3. 
4. 

Q. Among the following pair of $S_{N}1$ reactions in which pair the second reaction is more reactive than the first?

1. $\left(i\right)M{e}_{3}CCl+H_{2}O\to M{e}_{3}COH\left(ii\right)M{e}_{3}CBr+H_{2}O\to M{e}_{3}COH$
2. $\left(i\right)M{e}_{3}CCl+C{H}_{3}OH\to M{e}_{3}C-OC{H}_3\left(ii\right)M{e}_{3}CCl+H_{2}O\to M{e}_{3}C-OH$
3. $\left(i\right)\underset{\left(1M\right)}{M{e}_{3}CCl}+H_{2}O\to \left(ii\right)\underset{\left(2M\right)}{M{e}_{3}CCl}+H_{2}O\to$
4. All of the above.

Q.

Predict the products of the reaction of hex-2-yne with the following.

1. 2 equivalents of $B{r}_2$
2. equivalent of$HBr$
3. Excess $HBr$
4. $LiinN{H}_3$
5. $H_{2}O,HgS{O}_4,H_{2}S{O}_4$
In how many of these reactions, do we get a mixture of products?

1. 1
2. 2
3. 3
4. 4

Q. $S_{N}1$ reaction undergoes through a carbocation intermediate as follows:
$R-X\left(aq\right)\stackrel{slow}{\rightleftharpoons }{R}^{+}\left(aq\right)+X^{-}\left(aq\right)\underset{Fast}{\overset{H_{2}O}{\to }}ROH\left(aq\right)+H^{+}\left(aq\right)$

$[R=t-Bu,iso-Pr,Et,Me]$

Choose the correct statement(s):

1. The decreasing order of rate of $S_{N}1$ reaction is: $t-BuX>iso-PrX>EtX>MeX$
2. The decreasing order of ionization energy is: $MeX>EtX>iso-PrX>t-BuX$
3. The decreasing order of energy of activation is: $t-BuX>iso-PrX>EtX>MeX$
4. The decreasing order of rate of $S_{N}1$ reaction is: $MeX>EtX>iso-PrX>t-BuX$

Q. Identify Z in sequence of reactions :

1. $(C{H}_2{)}_3-C{H}_2-O-C{H}_{2}C{H}_3$
2. $C{H}_3-(C{H}_2{)}_4-O-C{H}_3$
3. $C{H}_{3}C{H}_2-CH-O-C{H}_{2}C{H}_3$
4. $C{H}_3-(C{H}_2{)}_3-O-C{H}_{2}C{H}_3$

Q. What is Saytzeff (Zaitsev) rule? Explain elimination reaction in 2-bromopentane.

Q. The major product formed when excess of $HCl$ reacts with 2-Butyne?

1. 
2. 
3. 
4. 

Q. Which of the following compound is produced when $C{H}_2=CH-(C{H}_2{)}_{2}COOH$ reacts with HBr in presence of peroxides

1. $C{H}_{3}CH(C{H}_2{)}_{5}COOH$
2. $BrC{H}_{2}C{H}_2(C{H}_2{)}_{5}COOH$
3. $C{H}_{3}C{H}_{2}C{H}_2(C{H}_2{)}_{5}COOH$
4. $C{H}_{3}C{H}_{2}BrC{H}_{2}C{H}_{2}COOH$

Q. The name of the product obtained by the addition of HI to propene in presence of peroxide catalyst is

1. Isopropyl iodide
2. 2-Iodopropene
3. 1-Iodopropane
4. 2-Iodopropane