JEE Advanced · Chemistry · 4. Chemical Bonding

Each of the following options contains a set of four molecules. Identify the option(s) where all four molecules possess permanent dipole moment at room temperature.

A $B e C l_{2}, C O_{2}, B C l_{3}, C H C l_{3}$
B $S O_{2}, C_{6} H_{5} C l, H_{2} S e, B r F_{5}$
C $B F_{3}, O_{3}, S F_{6}, X e F_{6}$
D $N O_{2}, N H_{3}, P O C l_{3}, C H_{3} C l$

Verified Solution

Answer & Solution

Correct Answer

(D) $N O_{2}, N H_{3}, P O C l_{3}, C H_{3} C l$

Step-by-step Solution

Detailed explanation

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

An aqueous solution of X is added slowly to an aqueous solution of Y as shown in List I. The variation in conductivity of these reactions is given in List II. Match List I with List II and select the correct using answer the code given below the lists :

List - I	List - II
a. $\underset{\quad\quad~~ X }{( C _2 H _5)_3 N}+\underset{ Y }{CH _3 COOH}$	p. Conductivity decreases and then increases
b. $\underset{\quad\quad~~ X }{KI (0.1 M )}+\underset{ Y }{AgNO _3(0.01 M )}$	q. Conductivity decreases and then does not change much
c. $\underset{\text X }{CH _3 COOH}+\underset{\text Y }{KOH}$	r. Conductivity increases and then does not change much
d. $\underset{\text X }{NaOH}+\underset{\text Y }{HI}$	s. Conductivity does not change much and then increases

JEE Advanced 2013 Medium

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From JEE Advanced

Consider the kinetic data given in the following table for the reaction

A + B + C \to

Product.

Ex peri ment No.	$[\text A]$ $(\text{mol}$ $\text{dm} ^{-3})$	$[\text B]$ $(\text{mol}$ $\text{dm} ^{-3})$	$[\text C]$ $(\text{mol}$ $\text{dm} ^{-3})$	Rate of reaction $(\text{mol}$ $\text{dm} ^{-3}$ $\text s^{-1})$
1	0.2	0.1	0.1	$6.0 \times$ $10^{-5}$
2	0.2	0.2	0.1	$6.0 \times $ $10^{-5}$
3	0.2	0.1	0.2	$1.2 \times $ $10^{-4}$
4	0.3	0.1	0.1	$9.0 \times $ $10^{-5}$

The rate of the reaction for

[A] = 0.15 m o l d m^{- 3}, [B] = 0.25 m o l d m^{- 3}

and

[C] = 0.15 m o l d m^{- 3}

is found to be

Y \times 10^{- 5} m o l d m^{- 3} s^{- 1} .

The value of

Y

is __________

JEE Advanced 2019 Medium

Match the following

Column I	Column II
(A) $CH _3- CHBr - CD _3$ on treatment with alc. KOH gives $CH _2= CH - CD _3$ as a major product.	(P) E1 reaction
(B) $Ph - CHBr - CH _3$ reacts faster than $Ph - CHBr - CD _3$	(Q) E2 reaction
(C) $Ph - CH _2- CH _2 Br$ on treatment with $C _2 H _5 OD / C _2 H _5 O ^{-}$gives $Ph - CD = CH _2$ as the major product	(R) El cb reaction
(D) $PhCH _2 CH _2 Br$ and $PhCH _2 CH _2 Br$ react with same rate	(S) First order reaction

JEE Advanced 2006 Medium

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List - I	List - II
a. \(\underset{\quad\quad~~ X }{( C _2 H _5)_3 N}+\underset{ Y }{CH _3 COOH}\)	p. Conductivity decreases and then increases
b. \(\underset{\quad\quad~~ X }{KI (0.1 M )}+\underset{ Y }{AgNO _3(0.01 M )}\)	q. Conductivity decreases and then does not change much
c. \(\underset{\text X }{CH _3 COOH}+\underset{\text Y }{KOH}\)	r. Conductivity increases and then does not change much
d. \(\underset{\text X }{NaOH}+\underset{\text Y }{HI}\)	s. Conductivity does not change much and then increases

Ex peri ment No.	\([\text A]\) \((\text{mol}\) \(\text{dm} ^{-3})\)	\([\text B]\) \((\text{mol}\) \(\text{dm} ^{-3})\)	\([\text C]\) \((\text{mol}\) \(\text{dm} ^{-3})\)	Rate of reaction \((\text{mol}\) \(\text{dm} ^{-3}\) \(\text s^{-1})\)
1	0.2	0.1	0.1	\(6.0 \times\) \(10^{-5}\)
2	0.2	0.2	0.1	\(6.0 \times \) \(10^{-5}\)
3	0.2	0.1	0.2	\(1.2 \times \) \(10^{-4}\)
4	0.3	0.1	0.1	\(9.0 \times \) \(10^{-5}\)

Column I	Column II
(A) \(CH _3- CHBr - CD _3\) on treatment with alc. KOH gives \(CH _2= CH - CD _3\) as a major product.	(P) E1 reaction
(B) \(Ph - CHBr - CH _3\) reacts faster than \(Ph - CHBr - CD _3\)	(Q) E2 reaction
(C) \(Ph - CH _2- CH _2 Br\) on treatment with \(C _2 H _5 OD / C _2 H _5 O ^{-}\)gives \(Ph - CD = CH _2\) as the major product	(R) El cb reaction
(D) \(PhCH _2 CH _2 Br\) and \(PhCH _2 CH _2 Br\) react with same rate	(S) First order reaction