Addition of Organometallic Reagents to Aldehydes and Ketones

Q. Which one is not an organometallic compound?

1. RMgX
2. $Pb(C{H}_3{)}_4$
3. $\left[\right(C{H}_3{)}_{2}Cu]L{i}^{+}$
4. $C_2{H}_{5}ONa$

Q.

Predict the products formed when cyclohexanecarbaldehyde reacts with following reagents.

(i) PhMgBr and then H₃O⁺

(ii)Tollens’ reagent

(iii) Semicarbazide and weak acid

(iv)Excess ethanol and acid

(v) Zinc amalgam and dilute hydrochloric acid

Q. Which of the following is/are an organometallic compound?

1. $RMgX$
2. $Pb(C{H}_3{)}_4$
3. $\left[\right(C{H}_3{)}_{2}Cu]L{i}^{+}$
4. $C_2{H}_{5}ONa$

Q. An alkyl halide reacted with a metal cyanide to give an alkanenitrile. The metal cyanide is

1. $AgCN$
2. $KCN$
3. $C{u}_2(CN{)}_2$
4. All of the above

Q. Consider the following reaction:
$\text{Barium adipate}\underset{\Delta ,-BaC{O}_3}{\overset{\text{Dry distillation}}{\to }}\left(A\right)\underset{aq.HCl}{\overset{Zn-Hg}{\to }}\left(B\right)$

Compound (B) is:

1. 
2. 
3. 
4. 

Q. Which one of the following solvents favors $S_{N}2$ reaction?

1. DMSO
2. Ethanol
3. Acetone
4. water

1. 1 & 3
2. 1 & 2
3. 1 & 4
4. All four

Q. The organometallic compound among the following is

1. $C{H}_{3}MgBr$
2. $(C{H}_{3}COO{)}_{2}Pb$
3. $C{H}_{3}COONa$
4. All of these

Q. Grignard reagent behave as

1. $\mathrm{Nucleophile}\mathrm{only}$
2. $\mathrm{Base}\mathrm{only}$
3. $\mathrm{Nucleophile}\mathrm{as}\mathrm{well}\mathrm{as}\mathrm{base}$
4. $\mathrm{Electrophile}$

Q. Which one of the following(s) is/are incorrect regarding $S_{N}1$ reaction?

1. Polar aprotic solvents are favourable
2. Strong nucleophiles are preferred
3. Nucleophile is involved in the RDS
4. Rate depends on R-X

Q. The correct pair(s) of the ambident nucleophiles is (are):

$\left(A\right)AgCN/KCN$

$\left(B\right)RCOOAg/RCOOK$

$\left(C\right)AgN{O}_2/KN{O}_2$

$\left(D\right)AgI/KI$

1. (A) and (C) only
2. (B) only
3. (B) and (C) only
4. (A) only

Q. Two elements $X$ and $Y$ belong to Groups $1$ and $2$ respectively in the same period of the Periodic Table. Compare these elements with respect to :
(i) Number of electrons in their outer-most orbit.
(ii) Their atomic size and their valencies.
(iii) Their ionisation energy and metallic character.
(iv) Formulae of their chlorides and sulphates.

Q.
"x" will be

Q. Grignard reagent behave as

1. $\mathrm{Nucleophile}\mathrm{only}$
2. $\mathrm{Base}\mathrm{only}$
3. $\mathrm{Nucleophile}\mathrm{as}\mathrm{well}\mathrm{as}\mathrm{base}$
4. $\mathrm{Electrophile}$

Q. What base should be used to obtain products from $E_2$ mechanism only?

1. $NaOH$
2. $KOH$
3. $EtOH$
4. $EtONa$

Q. An element is placed in 2nd group and 3rd period of the periodic table burns in the presence of oxygen to form a basic oxide.

1. Calcium (Ca)
2. Magnesium (Mg)
3. Sodium (Na)
4. Potassium (K)

Q. Identify (A) and (B) in the given sequence of reaction $PhC{H}_{2}CHO\stackrel{Se{O}_2}{\to }\left(A\right)\underset{\left(ii\right)H^{+}}{\overset{\left(i\right)con.O{H}^{-}}{\to }}$ (B)

Q. Which one of the following solvents favors $S_{N}2$ reaction?

1. DMSO
2. Ethanol
3. Acetone
4. water

1. 1 & 3
2. 1 & 2
3. 1 & 4
4. All four

Q. Convert:
PhCHO into PhCH = CHCOPh .

1. CH${}_3$MgI, H${}_3$O${}^{+}$, H${}^{+}$/K${}_2$Cr${}_2$O${}_7$, PhCHO/$\stackrel{⊝}{O}$H, $\Delta$
2. CH${}_3$MgI, H$O^{-}$, H${}^{+}$/K${}_2$Cr${}_3$O${}_6$, PhCHO/$\stackrel{⊝}{O}H,\Delta$
3. CH${}_3$MgBr, H${}_3$O${}^{+}$, H${}^{+}$/K${}_2$Cr${}_4$O${}_7$, PhCHO/$\stackrel{⊝}{O}$H, $\Delta$
4. None of these

Q. $C{H}_3-Mg-Br$ is an organo metallic compound due to:

1. $Mg-Br$ bond
2. $C-Mg$ bond
3. $C-Br$ bond
4. $C-H$ bond

Q. The non-metallic cation is present in :

1. $Cr{O}_2{Cl}_2$
2. $VOCl$
3. ${NH}_{4}Cl$
4. $P{Cl}_3$

Q. Organometallic reagents reacts with carbonyl compounds only at low to moderate temperature and in the presence aprotic solvents.

1. False
2. True

Q.

Predict the products formed when cyclohexane carbaldehyde reacts with following reagents.

PhMgBr and then $H_3{O}^{+}$

Tollen's reagent

Semicarbazide and weak acid

Excess ethanol and acid

Zinc amalgam and dilute hydrochloric acid