Consider the following compounds: $\text { (i) } \mathrm{C}_6 \mathrm{H}_5 \mathrm{COCl}$ ![NEET 2007 Chemistry, General Organic Chemistry — question figure 1](https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/616059730283de43c87e3e22/Chemistry/images/General_Organic_Chemistry/66bcbe06ae81d148616b15ff/question_1__q_66bcbe06ae81d148616b15ff__cdn-question-pool.getmarks.app__bnm9dCuRdem4JtQ5zEqvvX493GPiw9Bgcsr2Kn9xrmQ.original.fullsiz__a9056dd5f1_final_ppt_sync.png) ![NEET 2007 Chemistry, General Organic Chemistry — question figure 2](https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/616059730283de43c87e3e22/Chemistry/images/General_Organic_Chemistry/66bcbe06ae81d148616b15ff/question_2__q_66bcbe06ae81d148616b15ff__cdn-question-pool.getmarks.app__4Wv3DyqV2sUulLLS4Z6serZdhkjBBrHdCdordaDq5lI.original.fullsiz__b2fe0f91f7_final_ppt_sync.png) ![NEET 2007 Chemistry, General Organic Chemistry — question figure 3](https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/616059730283de43c87e3e22/Chemistry/images/General_Organic_Chemistry/66bcbe06ae81d148616b15ff/question_3__q_66bcbe06ae81d148616b15ff__cdn-question-pool.getmarks.app__BQ90OErJWn92E4JWsAJB9ei4uHFMBcVMETLLzaSGQRM.original.fullsiz__98670611c4_final_ppt_sync.png) The correct decreasing order of their reactivity towards hydrolysis is:

Electron withdrawing group increases the positive charge and electron releasing group decreases the negative change. The degree of hydrolysis increases as the magnitude of positive charge on carbonyl group increases. Among these $\mathrm{NO}_2$ \& $\mathrm{CHO}$ are electron withdrawing group from which $\mathrm{NO}_2$ has more $-\mathrm{I}$ effect than-CHO. On the other hand $\mathrm{CH}_3$ is a electron releasing group. Thus, the order of reactivity towards hydrolysis is ![NEET 2007 Chemistry, General Organic Chemistry — solution figure](https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/616059730283de43c87e3e22/Chemistry/images/General_Organic_Chemistry/66bcbe06ae81d148616b15ff/solution_1__q_66bcbe06ae81d148616b15ff__cdn-question-pool.getmarks.app__npiroUhwMqC45jHgt2UCMVreYdTRafzjYuTu47ekLYY.original.fullsiz__33f9dd409e_final_ppt_sync.png) Related Theory The mesomeric effect is negative $(-M)$ when the substituent is an electron-withdrawing group and the effect is positive $(+M)$ when the substituent is an electron donating group.

Consider the following compounds: (i) C_6… - NEET UG 2007 Chemistry PYQ

NEET UG 2007 — Chemistry Organic Chemistry

2007mcqmedium

Consider the following compounds: $\text { (i) } \mathrm{C}_6 \mathrm{H}_5 \mathrm{COCl}$ NEET 2007 Chemistry, General Organic Chemistry — question figure 1

NEET 2007 Chemistry, General Organic Chemistry — question figure 2

NEET 2007 Chemistry, General Organic Chemistry — question figure 3

The correct decreasing order of their reactivity towards hydrolysis is:

Official previous-year question

Held on 30 Apr 2007 · Verified 9 Jul 2026.

Options

A
(i) $>$ (ii) $>$ (iii) $>$ (iv)
B
(iv) $>$ (ii) $>$ (i) $>$ (iii)
C
(ii) $>$ (iv) $>$ (i) $>$ (iii)
D
(ii) $>$ (iv) $>$ (iii) $>$ (iv)

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Solution

Electron withdrawing group increases the positive charge and electron releasing group decreases the negative change. The degree of hydrolysis increases as the magnitude of positive charge on carbonyl group increases. Among these $\mathrm{NO}_2$ & $\mathrm{CHO}$ are electron withdrawing group from which $\mathrm{NO}_2$ has more $-\mathrm{I}$ effect than-CHO. On the other hand $\mathrm{CH}_3$ is a electron releasing group. Thus, the order of reactivity towards hydrolysis is NEET 2007 Chemistry, General Organic Chemistry — solution figure

Related Theory The mesomeric effect is negative $(-M)$ when the substituent is an electron-withdrawing group and the effect is positive $(+M)$ when the substituent is an electron donating group.

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